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179-406: Death is the end of life ; the irreversible cessation of all biological functions that sustain a living organism . The remains of a former organism normally begin to decompose shortly after death. Death eventually and inevitably occurs in all organisms. Some organisms, such as Turritopsis dohrnii , are biologically immortal ; however, they can still die from means other than aging . Death

358-420: A double helix . The two DNA strands are known as polynucleotides since they are composed of simpler units called nucleotides . Each nucleotide is composed of a nitrogen-containing nucleobase —either cytosine (C), guanine (G), adenine (A), or thymine (T)—as well as a sugar called deoxyribose and a phosphate group . The nucleotides are joined to one another in a chain by covalent bonds between

537-420: A living systems theory viewpoint that does not necessarily depend on molecular chemistry. One systemic definition of life is that living things are self-organizing and autopoietic (self-producing). Variations of this include Stuart Kauffman 's definition as an autonomous agent or a multi-agent system capable of reproducing itself, and of completing at least one thermodynamic work cycle . This definition

716-428: A nucleus and other membrane-bound organelles , although they have circular DNA and ribosomes . Bacteria and Archaea are two domains of prokaryotes. The other primary type is the eukaryote cell, which has a distinct nucleus bound by a nuclear membrane and membrane-bound organelles, including mitochondria , chloroplasts , lysosomes , rough and smooth endoplasmic reticulum , and vacuoles . In addition, their DNA

895-410: A postmortem examination or an obduction , is a medical procedure that consists of a thorough examination of a human corpse to determine the cause and manner of a person's death and to evaluate any disease or injury that may be present. It is usually performed by a specialized medical doctor called a pathologist . Autopsies are either performed for legal or medical purposes. A forensic autopsy

1074-403: A universal common ancestor . This evolved into all the species that exist now, by way of many extinct species, some of which have left traces as fossils . Attempts to classify living things, too, began with Aristotle . Modern classification began with Carl Linnaeus 's system of binomial nomenclature in the 1740s. Living things are composed of biochemical molecules , formed mainly from

1253-546: A coma. In the case of sleep, electroencephalograms (EEGs) are used to tell the difference. The category of "brain death" is seen as problematic by some scholars. For instance, Dr. Franklin Miller, a senior faculty member at the Department of Bioethics, National Institutes of Health, notes: "By the late 1990s... the equation of brain death with death of the human being was increasingly challenged by scholars, based on evidence regarding

1432-407: A common origin. All life forms require certain core chemical elements for their biochemical functioning. These include carbon , hydrogen , nitrogen , oxygen , phosphorus , and sulfur —the elemental macronutrients for all organisms. Together these make up nucleic acids , proteins and lipids , the bulk of living matter. Five of these six elements comprise the chemical components of DNA,

1611-408: A concept of an afterlife that may hold the idea of judgment of good and bad deeds in one's life. There are also different customs for honoring the body, such as a funeral , cremation , or sky burial . After a death, an obituary may be posted in a newspaper, and the "survived by" kin and friends usually go through the grieving process . The concept of death is the key to human understanding of

1790-524: A consequence of these microbial activities, the physical-chemical environment on Earth has been changing on a geologic time scale , thereby affecting the path of evolution of subsequent life. For example, the release of molecular oxygen by cyanobacteria as a by-product of photosynthesis induced global changes in the Earth's environment. Because oxygen was toxic to most life on Earth at the time, this posed novel evolutionary challenges, and ultimately resulted in

1969-443: A definition of the moment of death is required, doctors and coroners usually turn to "brain death" or "biological death" to define a person as being dead; people are considered dead when the electrical activity in their brain ceases. It is presumed that an end of electrical activity indicates the end of consciousness . Suspension of consciousness must be permanent and not transient, as occurs during certain sleep stages, and especially

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2148-662: A direct ancestor; in any case, the emphasis is placed on faith being the only requirement for the Abrahamic Covenant to apply (see also New Covenant and supersessionism ). In Christian belief, Abraham is a role model of faith, and his obedience to God by offering Isaac is seen as a foreshadowing of God's offering of his son Jesus. Christian commentators have a tendency to interpret God's promises to Abraham as applying to Christianity subsequent to, and sometimes rather than (as in supersessionism), being applied to Judaism, whose adherents rejected Jesus . They argue this on

2327-656: A few core chemical elements . All living things contain two types of large molecule, proteins and nucleic acids , the latter usually both DNA and RNA : these carry the information needed by each species, including the instructions to make each type of protein. The proteins, in turn, serve as the machinery which carries out the many chemical processes of life. The cell is the structural and functional unit of life. Smaller organisms, including prokaryotes (bacteria and archaea ), consist of small single cells. Larger organisms , mainly eukaryotes , can consist of single cells or may be multicellular with more complex structure. Life

2506-442: A host cell to make new products. Virus self-assembly within host cells has implications for the study of the origin of life , as it may support the hypothesis that life could have started as self-assembling organic molecules . Some of the earliest theories of life were materialist, holding that all that exists is matter, and that life is merely a complex form or arrangement of matter. Empedocles (430 BC) argued that everything in

2685-424: A living being can survive all calamities but eventually dies due to causes relating to old age. Conversely, premature death can refer to a death that occurs before old age arrives, for example, human death before a person reaches the age of 75. Animal and plant cells normally reproduce and function during the whole period of natural existence, but the aging process derives from the deterioration of cellular activity and

2864-466: A matter of debate; viruses lack characteristics of life such as cell membranes, metabolism and the ability to grow or respond to their environments. Viruses have been classed into "species" based on their genetics , but many aspects of such a classification remain controversial. The original Linnaean system has been modified many times, for example as follows: The attempt to organise the Eukaryotes into

3043-526: A month in a simulated Martian environment . Beyond the Solar System, the region around another main-sequence star that could support Earth-like life on an Earth-like planet is known as the habitable zone . The inner and outer radii of this zone vary with the luminosity of the star, as does the time interval during which the zone survives. Stars more massive than the Sun have a larger habitable zone, but remain on

3222-399: A previous miscarriage, and the use of abortion can increase the chances of having a miscarriage. An abortion may be performed for many reasons, such as pregnancy from rape , financial constraints of having a child, teenage pregnancy , and the lack of support from a significant other . There are two forms of abortion: a medical abortion and an in-clinic abortion or sometimes referred to as

3401-448: A resurgence of interest in the work of Russell, Barge and colleagues. Hylomorphism is a theory first expressed by the Greek philosopher Aristotle (322 BC). The application of hylomorphism to biology was important to Aristotle, and biology is extensively covered in his extant writings . In this view, everything in the material universe has both matter and form, and the form of a living thing

3580-801: A set of 355 genes from the last universal common ancestor was tentatively identified. The biosphere is postulated to have developed, from the origin of life onwards, at least some 3.5 billion years ago. The earliest evidence for life on Earth includes biogenic graphite found in 3.7 billion-year-old metasedimentary rocks from Western Greenland and microbial mat fossils found in 3.48 billion-year-old sandstone from Western Australia . More recently, in 2015, "remains of biotic life " were found in 4.1 billion-year-old rocks in Western Australia. In 2017, putative fossilised microorganisms (or microfossils ) were announced to have been discovered in hydrothermal vent precipitates in

3759-605: A short period Linnaeus had classified them in the taxon Vermes in Animalia, but later placed them back in Plantae. Herbert Copeland classified the Fungi in his Protoctista , including them with single-celled organisms and thus partially avoiding the problem but acknowledging their special status. The problem was eventually solved by Whittaker , when he gave them their own kingdom in his five-kingdom system . Evolutionary history shows that

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3938-462: A small number of kingdoms has been challenged. The Protozoa do not form a clade or natural grouping, and nor do the Chromista (Chromalveolata). The ability to sequence large numbers of complete genomes has allowed biologists to take a metagenomic view of the phylogeny of the whole tree of life . This has led to the realisation that the majority of living things are bacteria, and that all have

4117-401: A surgical abortion. A medical abortion involves taking a pill that will terminate the pregnancy no more than 11 weeks past the last period , and an in-clinic abortion involves a medical procedure using suction to empty the uterus; this is possible after 12 weeks, but it may be more difficult to find an operating doctor who will go through with the procedure. Senescence refers to a scenario when

4296-408: A thousand years. In the late 1740s, Carl Linnaeus introduced his system of binomial nomenclature for the classification of species. Linnaeus attempted to improve the composition and reduce the length of the previously used many-worded names by abolishing unnecessary rhetoric, introducing new descriptive terms and precisely defining their meaning. The fungi were originally treated as plants. For

4475-438: A vegetative state or coma, in that the former situation describes a state that is beyond recovery. EEGs can detect spurious electrical impulses, while certain drugs, hypoglycemia , hypoxia , or hypothermia can suppress or even stop brain activity temporarily; because of this, hospitals have protocols for determining brain death involving EEGs at widely separated intervals under defined conditions. People maintaining that only

4654-452: Is aging , followed by cardiovascular disease , which is a disease that affects the heart or blood vessels . As of 2022, an estimated total of almost 110 billion humans have died, or roughly 94% of all humans to have ever lived. A substudy of gerontology known as biogerontology seeks to eliminate death by natural aging in humans, often through the application of natural processes found in certain organisms. However, as humans do not have

4833-518: Is a universal religion (i.e. membership is open to anyone). Like Judaism, it has a strictly unitary conception of God, called tawhid or "strict monotheism". The story of the creation of the world in the Quran is elaborated less extensively than in the Hebrew scripture, emphasizing the transcendence and universality of God, instead. According to the Quran, God says kun fa-yakūnu . The Quran describes God as

5012-532: Is a Kurdish religion which combines elements of Shi'a Islam with pre-Islamic Kurdish beliefs; it has been classified as Abrahamic due to its monotheism, incorporation of Islamic doctrines, and reverence for Islamic figures, especially Ali ibn Abi Talib , the fourth caliph and first imam of Shia Islam . A number of sources include the Baháʼí Faith established in the 19th century, since it historically emerged in an Islamic milieu, and shares several beliefs with

5191-411: Is a collective religious descriptor for elements shared by Judaism , Christianity , and Islam . It features prominently in interfaith dialogue and political discourse but also has entered academic discourse . However, the term has also been criticized for being uncritically adopted. Although historically the term Abrahamic religions was limited to Judaism, Christianity, and Islam, restricting

5370-407: Is a finite supply presented at birth. Later, Goldstone proposed the concept of production or income of adaptation energy which may be stored (up to a limit) as a capital reserve of adaptation. In recent works, adaptation energy is considered an internal coordinate on the "dominant path" in the model of adaptation. It is demonstrated that oscillations of well-being appear when the reserve of adaptability

5549-473: Is a mechanistic explanation for the origin of species by means of natural selection . At the beginning of the 20th century Stéphane Leduc (1853–1939) promoted the idea that biological processes could be understood in terms of physics and chemistry, and that their growth resembled that of inorganic crystals immersed in solutions of sodium silicate. His ideas, set out in his book La biologie synthétique , were widely dismissed during his lifetime, but has incurred

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5728-556: Is about 4.54 billion years . Life on Earth has existed for at least 3.5 billion years, with the oldest physical traces of life dating back 3.7 billion years. Estimates from molecular clocks, as summarised in the TimeTree public database, place the origin of life around 4.0 billion years ago. Hypotheses on the origin of life attempt to explain the formation of a universal common ancestor from simple organic molecules via pre-cellular life to protocells and metabolism. In 2016,

5907-424: Is almost exhausted. In 2012, suicide overtook car crashes as the leading cause of human injury deaths in the U.S., followed by poisoning, falls, and murder. Accidents and disasters, from nuclear disasters to structural collapses , also claim lives. One of the deadliest incidents of all time is the 1975 Banqiao Dam Failure , with varying estimates, up to 240,000 dead. Other incidents with high death tolls are

6086-677: Is also sometimes classified as Abrahamic, in particular due to its monotheism and use of the Bible as scripture. Chrislam , a group of related Nigerian religious movements which seek to syncretise Christianity and Islam, is sometimes also considered a minor Abrahamic religion. Other African diaspora religions, such as Haitian Vodou and Candomblé , are not classified as Abrahamic, despite originating in syncretism between Christianity and African traditional religions, since they are not monotheistic, and Abraham plays no role in them. Scholarly sources do not classify Sikhism as an Abrahamic religion, but it

6265-491: Is an irreversible process where someone loses their existence as a person. Historically, attempts to define the exact moment of a human's death have been subjective or imprecise. Death was defined as the cessation of heartbeat (cardiac arrest) and breathing , but the development of CPR and prompt defibrillation have rendered that definition inadequate because breathing and heartbeat can sometimes be restarted. This type of death where circulatory and respiratory arrest happens

6444-558: Is capable of forming the various specialised cells that form the adult organism. This specialisation allows multicellular organisms to exploit resources more efficiently than single cells. About 800 million years ago, a minor genetic change in a single molecule, the enzyme GK-PID , may have allowed organisms to go from a single cell organism to one of many cells. Cells have evolved methods to perceive and respond to their microenvironment, thereby enhancing their adaptability. Cell signalling coordinates cellular activities, and hence governs

6623-498: Is carried out when the cause of death may be a criminal matter, while a clinical or academic autopsy is performed to find the medical cause of death and is used in cases of unknown or uncertain death, or for research purposes. Autopsies can be further classified into cases where external examination suffices, and those where the body is dissected and an internal examination is conducted. Permission from next of kin may be required for internal autopsy in some cases. Once an internal autopsy

6802-436: Is complete the body is generally reconstituted by sewing it back together. A necropsy, which is not always a medical procedure, was a term previously used to describe an unregulated postmortem examination. In modern times, this term is more commonly associated with the corpses of animals. Death before birth can happen in several ways: stillbirth , when the fetus dies before or during the delivery process; miscarriage , when

6981-422: Is considered the starting point of modern organic chemistry . It is of historical significance because for the first time an organic compound was produced in inorganic reactions. During the 1850s Hermann von Helmholtz , anticipated by Julius Robert von Mayer , demonstrated that no energy is lost in muscle movement, suggesting that there were no "vital forces" necessary to move a muscle. These results led to

7160-467: Is controversial, given Mandaeism does not accept Abraham as a prophet, despite revering as prophets several other figures from the Jewish scriptures – on the contrary, they believe that Abraham was originally a priest of their religion, but became an apostate from it. Druze is another religion which emerged from Islam in the 11th century, and hence is sometimes also considered an Abrahamic religion. Yarsanism

7339-455: Is defined descriptively by the capacity for homeostasis , organisation , metabolism , growth , adaptation , response to stimuli , and reproduction . All life over time eventually reaches a state of death , and none is immortal . Many philosophical definitions of living systems have been proposed, such as self-organizing systems. Viruses in particular make definition difficult as they replicate only in host cells. Life exists all over

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7518-880: Is determined by the rate of aging for a species inherent in its genes . A recognized method of extending maximum lifespan is calorie restriction . Theoretically, the extension of the maximum lifespan can be achieved by reducing the rate of aging damage, by periodic replacement of damaged tissues , molecular repair , or rejuvenation of deteriorated cells and tissues. A United States poll found religious and irreligious people, as well as men and women and people of different economic classes, have similar rates of support for life extension, while Africans and Hispanics have higher rates of support than white people. 38% said they would desire to have their aging process cured. Researchers of life extension can be known as "biomedical gerontologists ." They try to understand aging, and develop treatments to reverse aging processes, or at least slow them for

7697-421: Is extended by the evolution of novel functions over time. Death is the termination of all vital functions or life processes in an organism or cell. One of the challenges in defining death is in distinguishing it from life. Death would seem to refer to either the moment life ends, or when the state that follows life begins. However, determining when death has occurred is difficult, as cessation of life functions

7876-403: Is generally applied to whole organisms; the equivalent for individual components of an organism, such as cells or tissues , is necrosis . Something that is not considered an organism, such as a virus , can be physically destroyed but is not said to die , as a virus is not considered alive in the first place. As of the early 21st century, 56 million people die per year. The most common reason

8055-425: Is its soul (Greek psyche , Latin anima ). There are three kinds of souls: the vegetative soul of plants, which causes them to grow and decay and nourish themselves, but does not cause motion and sensation; the animal soul , which causes animals to move and feel; and the rational soul , which is the source of consciousness and reasoning, which (Aristotle believed) is found only in man. Each higher soul has all of

8234-878: Is its connection with the Miʿrāj , where, according to traditional Muslim belief, Muhammad ascended through the Seven heavens on a horse like winged beast named Buraq , guided by the Archangel Gabriel , beginning from the Foundation Stone on the Temple Mount , in modern times under the Dome of the Rock . Even though members of Judaism, Christianity, and Islam do not all claim Abraham as an ancestor, some members of these religions have tried to claim him as exclusively theirs. For Jews , Abraham

8413-476: Is known as the circulatory definition of death (CDD). Proponents of the CDD believe this definition is reasonable because a person with permanent loss of circulatory and respiratory function should be considered dead. Critics of this definition state that while cessation of these functions may be permanent, it does not mean the situation is irreversible because if CPR is applied fast enough, the person could be revived. Thus,

8592-507: Is known by different names. Each of these religions preaches that God creates, is one, rules, reveals, loves, judges, punishes, and forgives. However, although Christianity does not profess to believe in three gods—but rather in three persons , or hypostases, united in one essence —the Trinitarian doctrine , a fundamental of faith for the vast majority of Christian denominations, conflicts with Jewish and Muslim concepts of monotheism. Since

8771-404: Is more of a process than a single event. It implies a slow shift from one spiritual state to another. Other definitions for death focus on the character of cessation of organismic functioning and human death, which refers to irreversible loss of personhood. More specifically, death occurs when a living entity experiences irreversible cessation of all functioning. As it pertains to human life, death

8950-407: Is most likely to exist, within wide bounds of uncertainty. A "Confidence of Life Detection" scale (CoLD) for reporting evidence of life beyond Earth has been proposed. Artificial life is the simulation of any aspect of life, as through computers, robotics , or biochemistry . Synthetic biology is a new area of biotechnology that combines science and biological engineering . The common goal

9129-470: Is not only plausible, but probable or inevitable, possibly resulting in a biophysical cosmology instead of a mere physical cosmology . Other planets and moons in the Solar System and other planetary systems are being examined for evidence of having once supported simple life, and projects such as SETI are trying to detect radio transmissions from possible alien civilisations. Other locations within

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9308-667: Is now seen as a process, more than an event: conditions once considered indicative of death are now reversible. Where in the process, a dividing line is drawn between life and death depends on factors beyond the presence or absence of vital signs . In general, clinical death is neither necessary nor sufficient for a determination of legal death . A patient with working heart and lungs determined to be brain dead can be pronounced legally dead without clinical death occurring. Life extension refers to an increase in maximum or average lifespan , especially in humans, by slowing or reversing aging processes through anti-aging measures. Aging

9487-428: Is often not simultaneous across organ systems. Such determination, therefore, requires drawing conceptual lines between life and death. This is problematic because there is little consensus over how to define life. The nature of death has for millennia been a central concern of the world's religious traditions and of philosophical inquiry. Many religions maintain faith in either a kind of afterlife or reincarnation for

9666-580: Is only known to exist on Earth but extraterrestrial life is thought probable . Artificial life is being simulated and explored by scientists and engineers. The definition of life has long been a challenge for scientists and philosophers. This is partially because life is a process, not a substance. This is complicated by a lack of knowledge of the characteristics of living entities, if any, that may have developed outside Earth. Philosophical definitions of life have also been put forward, with similar difficulties on how to distinguish living things from

9845-485: Is organised into chromosomes . All species of large complex organisms are eukaryotes, including animals, plants and fungi, though with a wide diversity of protist microorganisms . The conventional model is that eukaryotes evolved from prokaryotes, with the main organelles of the eukaryotes forming through endosymbiosis between bacteria and the progenitor eukaryotic cell. The molecular mechanisms of cell biology are based on proteins . Most of these are synthesised by

10024-483: Is primarily a revered ancestor or patriarch (referred to as Avraham Avinu (אברהם אבינו in Hebrew ) "Abraham our father") to whom God made several promises: chiefly, that he would have numberless descendants, who would receive the land of Canaan (the " Promised Land "). According to Jewish tradition, Abraham was the first post- Flood prophet to reject idolatry through rational analysis, although Shem and Eber carried on

10203-415: Is singular ( tawḥīd ) unique ( wāḥid ) and inherently One ( aḥad ), all-merciful and omnipotent. According to Islamic teachings, God exists without place and according to the Quran, "No vision can grasp him, but His grasp is over all vision: He is above all comprehension, yet is acquainted with all things." God, as referenced in the Quran, is the only God. Islamic tradition also describes

10382-500: Is something humans share with cetaceans called the mammalian diving reflex . As medical technologies advance, ideas about when death occurs may have to be reevaluated in light of the ability to restore a person to vitality after longer periods of apparent death (as happened when CPR and defibrillation showed that cessation of heartbeat is inadequate as a decisive indicator of death). The lack of electrical brain activity may not be enough to consider someone scientifically dead. Therefore,

10561-431: Is sometimes popularly misconceived as being one, in particular due to the theory that it is a syncretism of Hinduism and Islam, which was popular in older accounts but has been rejected as inaccurate by contemporary scholarship. Zoroastrianism is not considered an Abrahamic religion, since Abraham is not part of Zoroastrian religious traditions. All Abrahamic religions accept the tradition that God revealed himself to

10740-495: Is the all-powerful and all-knowing creator, sustainer, ordainer and judge of everything in existence. In contrast to the Jewish and Christian traditions, which depict God usually as anthropomorph, the Islamic conception of God is less personal, but rather of a conscious force behind all aspects of the universe only known through signs of nature, metaphorical stories, and revelation by the prophets and angels. Islam emphasizes that God

10919-417: Is the design and construction of new biological functions and systems not found in nature. Synthetic biology includes the broad redefinition and expansion of biotechnology, with the ultimate goals of being able to design and build engineered biological systems that process information, manipulate chemicals, fabricate materials and structures, produce energy, provide food, and maintain and enhance human health and

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11098-455: Is the founding patriarch of the children of Israel. God promised Abraham: "I will make of you a great nation, and I will bless you." With Abraham, God entered into "an everlasting covenant throughout the ages to be God to you and to your offspring to come". It is this covenant that makes Abraham and his descendants children of the covenant. Similarly, converts, who join the covenant, are all identified as sons and daughters of Abraham. Abraham

11277-482: Is the most common cause of death worldwide. Aging is seen as inevitable, so according to Aubrey de Grey little is spent on research into anti-aging therapies, a phenomenon known as pro-aging trance . The average lifespan is determined by vulnerability to accidents and age or lifestyle-related afflictions such as cancer or cardiovascular disease . Extension of lifespan can be achieved by good diet , exercise, and avoidance of hazards such as smoking . Maximum lifespan

11456-434: Is to define life as "a self-sustained chemical system capable of undergoing Darwinian evolution ", a definition adopted by a NASA committee attempting to define life for the purposes of exobiology , based on a suggestion by Carl Sagan . This definition, however, has been widely criticised because according to it, a single sexually reproducing individual is not alive as it is incapable of evolving on its own. Others take

11635-730: Is typically viewed as the heresy of idolatry by Islam and Judaism. Jerusalem is considered Judaism's holiest city. Its origins can be dated to 1004 BCE, when according to Biblical tradition David established it as the capital of the United Kingdom of Israel, and his son Solomon built the First Temple on Mount Moriah . Since the Hebrew Bible relates that Isaac's sacrifice took place there, Mount Moriah's importance for Jews predates even these prominent events. Jews thrice daily pray in its direction, including in their prayers pleas for

11814-509: Is unlikely or impossible. Organisms that have a wide range of tolerance are more widely distributed than organisms with a narrow range of tolerance. To survive, some microorganisms have evolved to withstand freezing , complete desiccation , starvation , high levels of radiation exposure , and other physical or chemical challenges. These extremophile microorganisms may survive exposure to such conditions for long periods. They excel at exploiting uncommon sources of energy. Characterization of

11993-462: Is viewed as problematic by some scholars, there are proponents of it that believe this definition of death is the most reasonable for distinguishing life from death. The reasoning behind the support for this definition is that brain death has a set of criteria that is reliable and reproducible. Also, the brain is crucial in determining our identity or who we are as human beings. The distinction should be made that "brain death" cannot be equated with one in

12172-569: The 1931 China floods , which killed an estimated 4 million people, although estimates widely vary; the 1887 Yellow River flood , which killed an estimated 2 million people in China; and the 1970 Bhola cyclone , which killed as many as 500,000 people in Pakistan. If naturally occurring famines are considered natural disasters, the Chinese famine of 1906–1907 , which killed 15–20 million people, can be considered

12351-582: The Hasmonean Kingdom , and modern Israel). It has been majority Jewish since about 1852 and continues through today. Jerusalem was an early center of Christianity . There has been a continuous Christian presence there since. William R. Kenan, Jr., professor of the history of Christianity at the University of Virginia , Charlottesville, writes that from the middle of the 4th century to the Islamic conquest in

12530-692: The International Ocean Discovery Program found unicellular life in 120 °C sediment 1.2 km below seafloor in the Nankai Trough subduction zone. According to one researcher, "You can find microbes everywhere—they're extremely adaptable to conditions, and survive wherever they are." The inert components of an ecosystem are the physical and chemical factors necessary for life—energy (sunlight or chemical energy ), water, heat, atmosphere , gravity , nutrients , and ultraviolet solar radiation protection . In most ecosystems,

12709-723: The Ishmaelites are descended from Abraham through his son Ishmael in the Arabian Peninsula. In its early stages, the Israelite religion shares traits with the Canaanite religions of the Bronze Age ; by the Iron Age , it had become distinct from other Canaanite religions as it shed polytheism for monolatry . They understood their relationship with their god, Yahweh , as a covenant and that

12888-954: The Last Supper in an "upper room" (traditionally the Cenacle ) there the night before he was crucified on the cross and was arrested in Gethsemane . The six parts to Jesus' trial—three stages in a religious court and three stages before a Roman court—were all held in Jerusalem. His crucifixion at Golgotha , his burial nearby (traditionally the Church of the Holy Sepulchre ), and his resurrection and ascension and prophecy to return all are said to have occurred or will occur there. Jerusalem became holy to Muslims, third after Mecca and Medina . The Al-Aqsa , which translates to "farthest mosque" in sura Al-Isra in

13067-496: The Nuvvuagittuq Belt of Quebec, Canada that were as old as 4.28 billion years, the oldest record of life on Earth, suggesting "an almost instantaneous emergence of life" after ocean formation 4.4 billion years ago , and not long after the formation of the Earth 4.54 billion years ago. Evolution is the change in heritable characteristics of biological populations over successive generations. It results in

13246-458: The Solar System that may host microbial life include the subsurface of Mars , the upper atmosphere of Venus , and subsurface oceans on some of the moons of the giant planets . Investigation of the tenacity and versatility of life on Earth, as well as an understanding of the molecular systems that some organisms utilise to survive such extremes, is important for the search for extraterrestrial life. For example, lichen could survive for

13425-509: The Wanggongchang explosion (when a gunpowder factory ended up with 20,000 deaths), a collapse of a wall of Circus Maximus that killed 13,000 people, and the Chernobyl disaster that killed between 95 and 4,000 people. Natural disasters kill around 45,000 people annually, although this number can vary to millions to thousands on a per-decade basis. Some of the deadliest natural disasters are

13604-485: The embryo dies before independent survival; and abortion , the artificial termination of the pregnancy. Stillbirth and miscarriage can happen for various reasons, while abortion is carried out purposely. Stillbirth can happen right before or after the delivery of a fetus. It can result from defects of the fetus or risk factors present in the mother. Reductions of these factors, caesarean sections when risks are present, and early detection of birth defects have lowered

13783-453: The neo-cortex of the brain is necessary for consciousness sometimes argue that only electrical activity should be considered when defining death. Eventually, the criterion for death may be the permanent and irreversible loss of cognitive function, as evidenced by the death of the cerebral cortex . All hope of recovering human thought and personality is then gone, given current and foreseeable medical technology. Even by whole-brain criteria,

13962-422: The personality and identity are irretrievably lost, so therefore, the person should be considered entirely dead. Brain death is sometimes used as a legal definition of death. For all organisms with a brain, death can instead be focused on this organ. The cause of death is usually considered important and an autopsy can be done. There are many causes, from accidents to diseases. Many cultures and religions have

14141-655: The prophets and messengers amongst the Children of Israel (Bani Israil), the Zabur ( Psalms ) revealed to Dawud ( David ) and the Injil (the Gospel ) revealed to Isa ( Jesus ). The Quran also mentions God having revealed the Scrolls of Abraham and the Scrolls of Moses . The relationship between Islamic and Hebrew scriptures and New Testament differs significantly from the relationship between

14320-741: The restrictions on pork consumption found in Jewish and Islamic dietary law), and key beliefs of Islam, Christianity, and the Baháʼí Faith not shared by Judaism (e.g., the prophetic and Messianic position of Jesus ). Jewish tradition claims that the Twelve Tribes of Israel are descended from Abraham through his son Isaac and grandson Jacob , whose sons formed the nation of the Israelites in Canaan ; Islamic tradition claims that twelve Arab tribes known as

14499-514: The siege of Jerusalem (70 CE), forced Jews to reconcile their belief-system with the destruction of the Second Temple and associated rituals. At this time, both Judaism and Christianity had to systematize their scriptures and beliefs, resulting in competing theologies both claiming Abrahamic heritage. Christians could hardly dismiss the Hebrew scriptures as Jesus himself refers to them according to Christian reports, and parallels between Jesus and

14678-480: The soul , or resurrection of the body at a later date. Whether or not viruses should be considered as alive is controversial. They are most often considered as just gene coding replicators rather than forms of life. They have been described as "organisms at the edge of life" because they possess genes , evolve by natural selection, and replicate by making multiple copies of themselves through self-assembly. However, viruses do not metabolise and they require

14857-467: The structure and metabolic diversity of microbial communities in such extreme environments is ongoing. The first classification of organisms was made by the Greek philosopher Aristotle (384–322 BC), who grouped living things as either plants or animals, based mainly on their ability to move. He distinguished animals with blood from animals without blood, which can be compared with the concepts of vertebrates and invertebrates respectively, and divided

15036-523: The " sons of God " rather than "children of Abraham". For Muslims, Abraham is a prophet , the " messenger of God" who stands in the line from Adam to Muhammad, to whom God gave revelations, , who "raised the foundations of the House" (i.e., the Kaaba ) with his first son, Isma'il , a symbol of which is every mosque. Ibrahim (Abraham) is the first in a genealogy for Muhammad. Islam considers Abraham to be "one of

15215-554: The 16th century, the birth and growth of Protestantism during the Reformation further split Christianity into many denominations . Christianity remains culturally diverse in its Western and Eastern branches , Christianity played a prominent role in the development of Western civilization . Islam is based on the teachings of the Quran . Although it considers Muhammad to be the Seal of

15394-663: The 1st century as a sect within Judaism initially led by Jesus . His followers viewed him as the Messiah , as in the Confession of Peter ; after his crucifixion and death they came to view him as God incarnate , who was resurrected and will return at the end of time to judge the living and the dead and create an eternal Kingdom of God . In the 1st century AD, under the Apostles of Jesus of Nazareth ; Christianity spread widely after it

15573-452: The 20th century and could kill 1 billion people worldwide in the 21st century, a World Health Organization report warned. Many leading developed world causes of death can be postponed by diet and physical activity , but the accelerating incidence of disease with age still imposes limits on human longevity . The evolutionary cause of aging is, at best, only beginning to be understood. It has been suggested that direct intervention in

15752-602: The 2nd century: "His greatness lacks nothing, but contains all things." In the 8th century, John of Damascus listed eighteen attributes which remain widely accepted. As time passed, theologians developed systematic lists of these attributes, some based on statements in the Bible (e.g., the Lord's Prayer , stating that the Father is in Heaven ), others based on theological reasoning. In Islamic theology , God ( Arabic : الله Allāh )

15931-436: The 7th century AD, Islam was founded by Muhammad in the Arabian Peninsula; it spread widely through the early Muslim conquests , shortly after his death. Islam understands its form of "Abrahamic monotheism" as preceding both Judaism and Christianity, and in contrast with Arabian Henotheism . The teachings of the Quran are believed by Muslims to be the direct and final revelation and words of God . Islam, like Christianity,

16110-534: The Abrahamic faiths, including monotheism and recognising Jewish, Christian and Islamic figures as prophets. Some also include Bábism , another 19th century movement which was a precursor to the Baháʼí Faith – but while most followers of Bábism became Baháʼís, a minority did not, and Bábism survives today as an independent religion, albeit only with a few thousand remaining followers. Rastafari , an Afrocentric religion which emerged from Christianity in 1930s Jamaica,

16289-415: The Abrahamic religions themselves. Proponents of the term argue that all three religions are united through the deity worshipped by Abraham. The Catholic scholar of Islam Louis Massignon stated that the phrase "Abrahamic religion" means that all these religions come from one spiritual source. The modern term comes from the plural form of a Quranic reference to dīn Ibrāhīm ("religion of Ibrahim"),

16468-717: The Arabic form of Abraham's name. In Christianity, Paul the Apostle , in Romans 4:11–12 , refers to Abraham as "father of all", including those "who have faith, circumcised or uncircumcised." From its founding, Islam likewise conceived of itself as the religion of Abraham. The Bahá’í scriptures state that the religion's founder, Baháʼu’lláh, descended from Abraham through his wife Keturah 's sons. The appropriateness of grouping Judaism, Christianity, and Islam as "Abrahamic religions" and related terms has been challenged. Adam Dodds argues that

16647-582: The Biblical stories of creation and redemption starting with Abraham in the Book of Genesis . The distant God asserted by Jesus according to the Christians, created a form of dualism between Creator and creation and the doctrine of Creatio ex nihilo , which later heavily influenced Jewish and Islamic theology. By that, Christians established their own identity, distinct from both Greeks and Jews, as those who venerate

16826-488: The Earth in air, water, and soil , with many ecosystems forming the biosphere . Some of these are harsh environments occupied only by extremophiles . Life has been studied since ancient times, with theories such as Empedocles 's materialism asserting that it was composed of four eternal elements , and Aristotle 's hylomorphism asserting that living things have souls and embody both form and matter. Life originated at least 3.5 billion years ago, resulting in

17005-520: The New Testament and the Hebrew Bible . Whereas the New Testament draws heavily on the Hebrew Bible and interprets its text in light of the foundations of the new religion, the Quran only alludes to various stories of Biblical writings, but remains independent of both, focusing on establishing a monotheistic message by utilizing the stories of the prophets in a religious decentralized environment. In

17184-686: The President's Commission for the Study of Ethical Problems in Medicine and Biomedical and Behavioral Research in 1980. They concluded that this approach to defining death sufficed in reaching a uniform definition nationwide. A multitude of reasons was presented to support this definition, including uniformity of standards in law for establishing death, consumption of a family's fiscal resources for artificial life support, and legal establishment for equating brain death with death to proceed with organ donation . Aside from

17363-414: The Quran and its surroundings are addressed in the Quran as "the holy land". Muslim tradition as recorded in the ahadith identifies al-Aqsa with a mosque in Jerusalem. The first Muslims did not pray toward Kaaba , but toward Jerusalem. The qibla was switched to Kaaba later on to fulfill the order of Allah of praying in the direction of Kaaba (Quran, Al-Baqarah 2:144–150). Another reason for its significance

17542-454: The Sun-like "main sequence" of stellar evolution for a shorter time interval. Small red dwarfs have the opposite problem, with a smaller habitable zone that is subject to higher levels of magnetic activity and the effects of tidal locking from close orbits. Hence, stars in the intermediate mass range such as the Sun may have a greater likelihood for Earth-like life to develop. The location of

17721-532: The United Nations Special Reporter on the Right to Food, 2000 – Mar 2008, mortality due to malnutrition accounted for 58% of the total mortality rate in 2006. Ziegler says worldwide, approximately 62 million people died from all causes and of those deaths, more than 36 million died of hunger or diseases due to deficiencies in micronutrients . Tobacco smoking killed 100 million people worldwide in

17900-403: The abandonment of scientific interest in vitalistic theories, especially after Eduard Buchner 's demonstration that alcoholic fermentation could occur in cell-free extracts of yeast. Nonetheless, belief still exists in pseudoscientific theories such as homoeopathy , which interprets diseases and sickness as caused by disturbances in a hypothetical vital force or life force. The age of Earth

18079-402: The aging process may now be the most effective intervention against major causes of death. Selye proposed a unified non-specific approach to many causes of death. He demonstrated that stress decreases the adaptability of an organism and proposed to describe adaptability as a special resource, adaptation energy . The animal dies when this resource is exhausted. Selye assumed that adaptability

18258-421: The annual Hajj pilgrimage. The conception of God as universal remains a common feature of all Abrahamic religions. The Abrahamic God is conceived of as eternal , omnipotent , omniscient and as the creator of the universe . God is further held to have the properties of holiness, justice, omnibenevolence , and omnipresence . Proponents of Abrahamic faiths believe that God is also transcendent , but at

18437-466: The appearance of new species and often the disappearance of old ones. Evolution occurs when evolutionary processes such as natural selection (including sexual selection ) and genetic drift act on genetic variation, resulting in certain characteristics increasing or decreasing in frequency within a population over successive generations. The process of evolution has given rise to biodiversity at every level of biological organisation . Fossils are

18616-444: The arguments for and against the CDD boil down to defining the actual words "permanent" and "irreversible," which further complicates the challenge of defining death. Furthermore, events causally linked to death in the past no longer kill in all circumstances; without a functioning heart or lungs, life can sometimes be sustained with a combination of life support devices, organ transplants , and artificial pacemakers . Today, where

18795-438: The array of biological functioning displayed by patients correctly diagnosed as having this condition who were maintained on mechanical ventilation for substantial periods of time. These patients maintained the ability to sustain circulation and respiration, control temperature, excrete wastes, heal wounds, fight infections and, most dramatically, to gestate fetuses (in the case of pregnant "brain-dead" women)." While "brain death"

18974-450: The attributes of the lower ones. Aristotle believed that while matter can exist without form, form cannot exist without matter, and that therefore the soul cannot exist without the body. This account is consistent with teleological explanations of life , which account for phenomena in terms of purpose or goal-directedness. Thus, the whiteness of the polar bear's coat is explained by its purpose of camouflage. The direction of causality (from

19153-399: The basic functions of multicellular organisms. Signaling between cells can occur through direct cell contact using juxtacrine signalling , or indirectly through the exchange of agents as in the endocrine system . In more complex organisms, coordination of activities can occur through a dedicated nervous system . Though life is confirmed only on Earth, many think that extraterrestrial life

19332-553: The basis that just as Abraham as a Gentile (before he was circumcised ) "believed God and it was credited to him as righteousness" (cf. Rom. 4:3, James 2:23), "those who have faith are children of Abraham" (see also John 8:39). This is most fully developed in Paul's theology where all who believe in God are spiritual descendants of Abraham. However, with regards to Rom. 4:20 and Gal. 4:9, in both cases he refers to these spiritual descendants as

19511-436: The biosphere, including soil , hot springs , inside rocks at least 19 km (12 mi) deep underground, the deepest parts of the ocean, and at least 64 km (40 mi) high in the atmosphere. For example, spores of Aspergillus niger have been detected in the mesosphere at an altitude of 48 to 77 km. Under test conditions, life forms have been observed to survive in the vacuum of space. Life forms thrive in

19690-457: The blooded animals into five groups: viviparous quadrupeds ( mammals ), oviparous quadrupeds (reptiles and amphibians ), birds, fishes and whales . The bloodless animals were divided into five groups: cephalopods , crustaceans , insects (which included the spiders, scorpions , and centipedes ), shelled animals (such as most molluscs and echinoderms ), and " zoophytes " (animals that resemble plants). This theory remained dominant for more than

19869-499: The brain must have completely ceased. However, in other jurisdictions, some follow the brainstem version of brain death. Afterward, a death certificate is issued in most jurisdictions, either by a doctor or by an administrative office, upon presentation of a doctor's declaration of death. There are many anecdotal references to people being declared dead by physicians and then "coming back to life," sometimes days later in their coffin or when embalming procedures are about to begin. From

20048-526: The category to these three religions has come under criticism. The late-19th-century Baháʼí Faith has been listed as Abrahamic by scholarly sources in various fields since it is a monotheistic religion that recognizes Abraham. The figure of Abraham is suggested as a common ground for Judaism, Christianity, Islam and a hypothesized eschatological reconciliation of the three. Commonalities may include creation , revelation , and redemption , but such shared concepts vary significantly between and within

20227-470: The concept of information-theoretic death has been suggested as a better means of defining when true death occurs, though the concept has few practical applications outside the field of cryonics . The leading cause of human death in developing countries is infectious disease . The leading causes in developed countries are atherosclerosis ( heart disease and stroke), cancer, and other diseases related to obesity and aging . By an extremely wide margin,

20406-546: The conception of a divine Trinity is not amenable to tawhid , the Islamic doctrine of monotheism, Islam regards Christianity as variously polytheistic . Christianity and Islam both revere Jesus ( Arabic : Isa or Yasu among Muslims and Arab Christians respectively) but with vastly differing conceptions: However, the worship of Jesus, or the ascribing of partners to God (known as shirk in Islam and as shituf in Judaism),

20585-412: The conditions vary during the day and from one season to the next. To live in most ecosystems, then, organisms must be able to survive a range of conditions, called the "range of tolerance". Outside that are the "zones of physiological stress", where the survival and reproduction are possible but not optimal. Beyond these zones are the "zones of intolerance", where survival and reproduction of that organism

20764-544: The creator of "heavens and earth", to emphasize that it is a universal God and not a local Arabian deity here. While many sources limit the list of Abrahamic religions to only include Judaism, Christianity and Islam, some sources include other religions as well. Samaritanism diverged from Judaism in the 6th to 3rd centuries BCE; although sometimes considered a branch of Judaism, most consider it to be an independent Abrahamic religion. Some sources consider Mandaeism to be an Abrahamic religion – however, that classification

20943-538: The deadliest natural disaster in recorded history. In animals, predation can be a common cause of death. Livestock have a 6% death rate from predation. However, younger animals are more susceptible to predation. For example, 50% of young foxes die to birds , bobcats , coyotes , and other foxes as well. Young bear cubs in the Yellowstone National Park only have a 40% chance to survive to adulthood from other bears and predators. An autopsy, also known as

21122-422: The deep Mariana Trench , and inside rocks up to 580 m (1,900 ft; 0.36 mi) below the sea floor under 2,590 m (8,500 ft; 1.61 mi) of ocean off the coast of the northwestern United States, and 2,400 m (7,900 ft; 1.5 mi) beneath the seabed off Japan. In 2014, life forms were found living 800 m (2,600 ft; 0.50 mi) below the ice of Antarctica. Expeditions of

21301-643: The deity of Jesus. After several periods of alternating persecution and relative peace vis-à-vis the Roman authorities under different administrations, Christianity became the state church of the Roman Empire in 380, but has been split into various churches from its beginning . An attempt was made by the Byzantine Empire to unify Christendom , but this formally failed with the East–West Schism of 1054. In

21480-587: The deity promised Abraham a permanent homeland. While the Book of Genesis speaks of multiple gods ( ʾĔlōhīm ), comparable to the Enūma Eliš speaking of various gods of the Canaanite pantheon to create the earth, at the time of the Babylonian captivity , Jewish theologians attributed the six-day narrative all to Yahweh , reflecting an early conception of Yahweh as a universal deity. The monolatrist nature of Yahwism

21659-534: The determination of brain death can be complicated. At present, in most places, the more conservative definition of death (irreversible cessation of electrical activity in the whole brain, as opposed to just in the neo-cortex) has been adopted. One example is the Uniform Determination Of Death Act in the United States. In the past, the adoption of this whole-brain definition was a conclusion of

21838-522: The environment. Abrahamic religions Abrahamic religions make up the largest major division in the study of comparative religion . By total number of adherents, Christianity and Islam comprise the largest and second-largest religious movements in the world, respectively. Judaism is the smallest of the three major Abrahamic religions, and Samaritanism is the smallest Abrahamic religion. Bábism and Druzism are offshoots of Abrahamic religions. The term Abrahamic religions (and its variations)

22017-523: The exception being sulfur. The latter is a component of the amino acids cysteine and methionine . The most abundant of these elements in organisms is carbon, which has the desirable attribute of forming multiple, stable covalent bonds . This allows carbon-based (organic) molecules to form the immense variety of chemical arrangements described in organic chemistry . Alternative hypothetical types of biochemistry have been proposed that eliminate one or more of these elements, swap out an element for one not on

22196-437: The figure to be closer to 800. In cases of electric shock , cardiopulmonary resuscitation (CPR) for an hour or longer can allow stunned nerves to recover, allowing an apparently dead person to survive. People found unconscious under icy water may survive if their faces are kept continuously cold until they arrive at an emergency room . This "diving response," in which metabolic activity and oxygen requirements are minimal,

22375-458: The first Muslims" (Surah 3)—the first monotheist in a world where monotheism was lost, and the community of those faithful to God, thus being referred to as ابونا ابراهيم or "Our Father Abraham", as well as Ibrahim al-Hanif or "Abraham the Monotheist". Also, the same as Judaism, Islam believes that Abraham rejected idolatry through logical reasoning. Abraham is also recalled in certain details of

22554-432: The flaws in this approach is that there are many organisms that are alive but probably not conscious. Another problem is in defining consciousness, which has many different definitions given by modern scientists, psychologists and philosophers. Additionally, many religious traditions, including Abrahamic and Dharmic traditions, hold that death does not (or may not) entail the end of consciousness. In certain cultures, death

22733-409: The formation of colonies of identical cells. These cells can form group organisms through cell adhesion . The individual members of a colony are capable of surviving on their own, whereas the members of a true multi-cellular organism have developed specialisations, making them dependent on the remainder of the organism for survival. Such organisms are formed clonally or from a single germ cell that

22912-470: The formation of Earth's major animal and plant species. This interplay between organisms and their environment is an inherent feature of living systems. The biosphere is the global sum of all ecosystems. It can also be termed as the zone of life on Earth, a closed system (apart from solar and cosmic radiation and heat from the interior of the Earth), and largely self-regulating. Organisms exist in every part of

23091-406: The fungi are more closely related to animals than to plants. As advances in microscopy enabled detailed study of cells and microorganisms, new groups of life were revealed, and the fields of cell biology and microbiology were created. These new organisms were originally described separately in protozoa as animals and protophyta/thallophyta as plants, but were united by Ernst Haeckel in

23270-480: The future to the past) is in contradiction with the scientific evidence for natural selection, which explains the consequence in terms of a prior cause. Biological features are explained not by looking at future optimal results, but by looking at the past evolutionary history of a species, which led to the natural selection of the features in question. Spontaneous generation was the belief that living organisms can form without descent from similar organisms. Typically,

23449-426: The given environment. This implies all or most of the following traits: From a physics perspective, an organism is a thermodynamic system with an organised molecular structure that can reproduce itself and evolve as survival dictates. Thermodynamically, life has been described as an open system which makes use of gradients in its surroundings to create imperfect copies of itself. Another way of putting this

23628-404: The heartbeat ceased, a status still known as clinical death . However, the development of cardiopulmonary resuscitation (CPR) meant that such a state was no longer strictly irreversible. Brain death was then considered a more fitting option, but several definitions exist for this. Some people believe that all brain functions must cease. Others believe that even if the brainstem is still alive,

23807-434: The idea was that certain forms such as fleas could arise from inanimate matter such as dust or the supposed seasonal generation of mice and insects from mud or garbage. The theory of spontaneous generation was proposed by Aristotle , who compiled and expanded the work of prior natural philosophers and the various ancient explanations of the appearance of organisms; it was considered the best explanation for two millennia. It

23986-512: The improvement of health and maintenance of youthfulness. Those who use life extension findings and apply them to themselves are called "life extensionists" or "longevists." The primary life extension strategy currently is to apply anti-aging methods to attempt to live long enough to benefit from a cure for aging. Life Life on Earth: Life is a quality that distinguishes matter that has biological processes , such as signaling and self-sustaining processes, from matter that does not. It

24165-496: The information to be preserved during reproduction and cell division. Within cells, DNA is organised into long structures called chromosomes . During cell division these chromosomes are duplicated in the process of DNA replication , providing each cell its own complete set of chromosomes. Eukaryotes store most of their DNA inside the cell nucleus . Cells are the basic unit of structure in every living thing, and all cells arise from pre-existing cells by division . Cell theory

24344-475: The issue of support of or dispute against brain death, there is another inherent problem in this categorical definition: the variability of its application in medical practice. In 1995, the American Academy of Neurology (AAN) established the criteria that became the medical standard for diagnosing neurologic death. At that time, three clinical features had to be satisfied to determine "irreversible cessation" of

24523-484: The jellyfish Turritopsis dohrnii , the hydra , and the planarian . Unnatural causes of death include suicide and predation . Of all causes, roughly 150,000 people die around the world each day. Of these, two-thirds die directly or indirectly due to senescence, but in industrialized countries – such as the United States, the United Kingdom, and Germany – the rate approaches 90% (i.e., nearly nine out of ten of all deaths are related to senescence). Physiological death

24702-632: The kingdom Protista ; later, the prokaryotes were split off in the kingdom Monera , which would eventually be divided into two separate groups, the Bacteria and the Archaea . This led to the six-kingdom system and eventually to the current three-domain system , which is based on evolutionary relationships. However, the classification of eukaryotes, especially of protists, is still controversial. As microbiology developed, viruses, which are non-cellular, were discovered. Whether these are considered alive has been

24881-474: The largest unifying cause of death in the developed world is biological aging, leading to various complications known as aging-associated diseases . These conditions cause loss of homeostasis , leading to cardiac arrest, causing loss of oxygen and nutrient supply, causing irreversible deterioration of the brain and other tissues . Of the roughly 150,000 people who die each day across the globe, about two thirds die of age-related causes. In industrialized nations,

25060-633: The later definitive form produced by the Ecumenical Council of 381 . Trinitarians, who form the large majority of Christians , hold it as a core tenet of their faith. Nontrinitarian denominations define the Father, the Son, and the Holy Spirit in a number of different ways. The theology of the attributes and nature of God has been discussed since the earliest days of Christianity, with Irenaeus writing in

25239-563: The list, or change required chiralities or other chemical properties. Deoxyribonucleic acid or DNA is a molecule that carries most of the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses. DNA and RNA are nucleic acids ; alongside proteins and complex carbohydrates , they are one of the three major types of macromolecule that are essential for all known forms of life. Most DNA molecules consist of two biopolymer strands coiled around each other to form

25418-430: The means to apply this to themselves, they have to use other ways to reach the maximum lifespan for a human, often through lifestyle changes, such as calorie reduction , dieting , and exercise . The idea of lifespan extension is considered and studied as a way for people to live longer. Determining when a person has definitively died has proven difficult. Initially, death was defined as occurring when breathing and

25597-576: The mid-18th century onwards, there was an upsurge in the public's fear of being mistakenly buried alive and much debate about the uncertainty of the signs of death. Various suggestions were made to test for signs of life before burial, ranging from pouring vinegar and pepper into the corpse's mouth to applying red hot pokers to the feet or into the rectum . Writing in 1895, the physician J.C. Ouseley claimed that as many as 2,700 people were buried prematurely each year in England and Wales, although some estimates peg

25776-508: The middle of the 19th century. It appealed to philosophers such as Henri Bergson , Friedrich Nietzsche , and Wilhelm Dilthey , anatomists like Xavier Bichat , and chemists like Justus von Liebig . Vitalism included the idea that there was a fundamental difference between organic and inorganic material, and the belief that organic material can only be derived from living things. This was disproved in 1828, when Friedrich Wöhler prepared urea from inorganic materials. This Wöhler synthesis

25955-560: The middle of the 7th century, the Roman province of Syria Palaestina was a Christian nation with Jerusalem its principal city. According to the New Testament , Jerusalem was the city Jesus was brought to as a child to be presented at the temple and for the feast of the Passover . He preached and healed in Jerusalem, unceremoniously drove the money changers in disarray from the temple there, held

26134-465: The moment when life ends. Determining when death has occurred is difficult, as cessation of life functions is often not simultaneous across organ systems. Such determination, therefore, requires drawing precise conceptual boundaries between life and death. This is difficult due to there being little consensus on how to define life. It is possible to define life in terms of consciousness. When consciousness ceases, an organism can be said to have died. One of

26313-406: The name is given to Moses when YHWH calls himself " I Am that I Am ", ( Hebrew : אהיה אשר אהיה ’ehye ’ăšer ’ehye ), seemingly connecting it to the verb hayah (הָיָה), meaning 'to be', but this is likely not a genuine etymology. Jewish tradition accords many names to God, including Elohim , Shaddai , and Sabaoth . In Christian theology , God is the eternal being who created and preserves

26492-448: The non-living. Legal definitions of life have been debated, though these generally focus on the decision to declare a human dead, and the legal ramifications of this decision. At least 123 definitions of life have been compiled. Since there is no consensus for a definition of life, most current definitions in biology are descriptive. Life is considered a characteristic of something that preserves, furthers or reinforces its existence in

26671-560: The oldest from the Archaean Eon, up to 3.4 billion years old. Extinction is the process by which a species dies out. The moment of extinction is the death of the last individual of that species. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively after a period of apparent absence. Species become extinct when they are no longer able to survive in changing habitat or against superior competition. Over 99% of all

26850-444: The other hand, believe that the rule does not uphold the best interests of the donors and that the rule does not effectively promote organ donation. Signs of death or strong indications that a warm-blooded animal is no longer alive are: The stages that follow after death are: The death of a person has legal consequences that may vary between jurisdictions. Most countries follow the whole-brain death criteria, where all functions of

27029-606: The parent cell divides into two or more daughter cells. For prokaryotes, cell division occurs through a process of fission in which the DNA is replicated, then the two copies are attached to parts of the cell membrane. In eukaryotes , a more complex process of mitosis is followed. However, the result is the same; the resulting cell copies are identical to each other and to the original cell (except for mutations ), and both are capable of further division following an interphase period. Multicellular organisms may have first evolved through

27208-457: The patriarch Abraham. All of them are monotheistic , and all of them conceive God to be a transcendent creator and the source of moral law . Their religious texts feature many of the same figures, histories, and places, although they often present them with different roles, perspectives, and meanings. Believers who agree on these similarities and the common Abrahamic origin tend to also be more positive towards other Abrahamic groups. In

27387-418: The phenomenon. There are many scientific approaches and various interpretations of the concept. Additionally, the advent of life-sustaining therapy and the numerous criteria for defining death from both a medical and legal standpoint have made it difficult to create a single unifying definition. One of the challenges in defining death is in distinguishing it from life. As a point in time, death seems to refer to

27566-466: The preserved remains or traces of organisms from the remote past. The totality of fossils, both discovered and undiscovered, and their placement in layers ( strata ) of sedimentary rock is known as the fossil record . A preserved specimen is called a fossil if it is older than the arbitrary date of 10,000 years ago. Hence, fossils range in age from the youngest at the start of the Holocene Epoch to

27745-464: The prophets , Islam teaches that every prophet preached Islam, as the word Islam literally means submission, the main concept preached by all prophets. Although the Quran is the central religious text of Islam, which Muslims believe to be a revelation from God, other Islamic books considered to be revealed by God before the Quran, mentioned by name in the Quran are the Tawrat ( Torah ) revealed to

27924-619: The proportion is much higher, approaching 90%. With improved medical capability, dying has become a condition to be managed . In developing nations , inferior sanitary conditions and lack of access to modern medical technology make death from infectious diseases more common than in developed countries . One such disease is tuberculosis , a bacterial disease that killed 1.8 million people in 2015. In 2004, malaria caused about 2.7 million deaths annually. The AIDS death toll in Africa may reach 90–100 million by 2025. According to Jean Ziegler ,

28103-661: The rate of stillbirth. However, 1% of births in the United States end in a stillbirth. A miscarriage is defined by the World Health Organization as, "The expulsion or extraction from its mother of an embryo or fetus weighing 500g or less." Miscarriage is one of the most frequent problems in pregnancy, and is reported in around 12–15% of all clinical pregnancies ; however, by including pregnancy losses during menstruation , it could be up to 17–22% of all pregnancies. There are many risk-factors involved in miscarriage; consumption of caffeine , tobacco , alcohol , drugs, having

28282-738: The restoration and the rebuilding of the Holy Temple (the Third Temple ) on mount Moriah, close the Passover service with the wistful statement "Next year in built Jerusalem," and recall the city in the blessing at the end of each meal. Jerusalem has served as the only capital for the five Jewish states that have existed in Israel since 1400 BCE (the United Kingdom of Israel , the Kingdom of Judah , Yehud Medinata ,

28461-456: The ribosomes through an enzyme-catalyzed process called protein biosynthesis . A sequence of amino acids is assembled and joined based upon gene expression of the cell's nucleic acid. In eukaryotic cells, these proteins may then be transported and processed through the Golgi apparatus in preparation for dispatch to their destination. Cells reproduce through a process of cell division in which

28640-721: The ruination of regular functioning. The aptitude of cells for gradual deterioration and mortality means that cells are naturally sentenced to stable and long-term loss of living capacities, even despite continuing metabolic reactions and viability. In the United Kingdom, for example, nine out of ten of all the deaths that occur daily relates to senescence, while around the world, it accounts for two-thirds of 150,000 deaths that take place daily. Almost all animals who survive external hazards to their biological functioning eventually die from biological aging , known in life sciences as "senescence." Some organisms experience negligible senescence , even exhibiting biological immortality . These include

28819-432: The rule: there must be an official declaration of death in a person before starting organ procurement, or that organ procurement cannot result in the death of the donor. A great deal of controversy has surrounded the definition of death and the dead donor rule. Advocates of the rule believe that the rule is legitimate in protecting organ donors while also countering any moral or legal objection to organ procurement. Critics, on

28998-448: The same time personal and involved, listening to prayer and reacting to the actions of his creatures. Jewish theology is unitarian. God is an absolute one, indivisible and incomparable being who is the ultimate cause of all existence. Jewish tradition teaches that the true aspect of God is incomprehensible and unknowable and that it is only God's revealed aspect that brought the universe into existence, and interacts with mankind and

29177-435: The soul, like everything else, was composed of fiery atoms. He elaborated on fire because of the apparent connection between life and heat, and because fire moves. Plato , in contrast, held that the world was organised by permanent forms , reflected imperfectly in matter; forms provided direction or intelligence, explaining the regularities observed in the world. The mechanistic materialism that originated in ancient Greece

29356-493: The species that have ever lived are now extinct. Mass extinctions may have accelerated evolution by providing opportunities for new groups of organisms to diversify. The diversity of life on Earth is a result of the dynamic interplay between genetic opportunity , metabolic capability, environmental challenges, and symbiosis . For most of its existence, Earth's habitable environment has been dominated by microorganisms and subjected to their metabolism and evolution. As

29535-484: The star within a galaxy may also affect the likelihood of life forming. Stars in regions with a greater abundance of heavier elements that can form planets, in combination with a low rate of potentially habitat -damaging supernova events, are predicted to have a higher probability of hosting planets with complex life. The variables of the Drake equation are used to discuss the conditions in planetary systems where civilisation

29714-408: The sugar of one nucleotide and the phosphate of the next, resulting in an alternating sugar-phosphate backbone . According to base pairing rules (A with T, and C with G), hydrogen bonds bind the nitrogenous bases of the two separate polynucleotide strands to make double-stranded DNA. This has the key property that each strand contains all the information needed to recreate the other strand, enabling

29893-494: The term "Abrahamic faiths", while helpful, can be misleading, as it conveys an unspecified historical and theological commonality that is problematic on closer examination. While there is a commonality among the religions, their shared ancestry is mainly peripheral to their respective foundational beliefs and thus conceals crucial differences. Alan L. Berger , professor of Judaic Studies at Florida Atlantic University , wrote that "while Judaism birthed both Christianity and Islam,

30072-632: The three main Abrahamic religions (Judaism, Christianity and Islam), the individual, God, and the universe are highly separate from each other. The Abrahamic religions believe in a judging, paternal, fully external god to which the individual and nature are both subordinate. One seeks salvation or transcendence not by contemplating the natural world or via philosophical speculation, but by seeking to please God (such as obedience with God's wishes or his law) and see divine revelation as outside of self, nature, and custom. All Abrahamic religions claim to be monotheistic, worshiping an exclusive God, although one who

30251-604: The three monotheistic faiths went their separate ways" and "each tradition views the patriarchal figure differently as seen in the theological claims they make about him." Aaron W. Hughes , meanwhile, describes the term as "imprecise" and "largely a theological neologism ." The common Christian doctrines of Jesus's Incarnation , the Trinity , and the resurrection of Jesus , for example, are accepted in neither Judaism nor Islam. There are fundamental beliefs in both Islam and Judaism that are likewise denied by most of Christianity (e.g.,

30430-412: The total brain, including coma with clear etiology, cessation of breathing, and lack of brainstem reflexes. These criteria were updated again, most recently in 2010, but substantial discrepancies remain across hospitals and medical specialties. The problem of defining death is especially imperative as it pertains to the dead donor rule , which could be understood as one of the following interpretations of

30609-552: The tradition from Noah . Christians view Abraham as an important exemplar of faith , and a spiritual, as well as physical, ancestor of Jesus. For Christians, Abraham is a spiritual forebear as well as/rather than a direct ancestor depending on the individual's interpretation of Paul the Apostle , with the Abrahamic covenant "reinterpreted so as to be defined by faith in Christ rather than biological descent" or both by faith as well as

30788-413: The universe is made up of a combination of four eternal "elements" or "roots of all": earth, water, air, and fire. All change is explained by the arrangement and rearrangement of these four elements. The various forms of life are caused by an appropriate mixture of elements. Democritus (460 BC) was an atomist ; he thought that the essential characteristic of life was having a soul ( psyche ), and that

30967-461: The world. Christians believe God to be both transcendent and immanent (involved in the world). Early Christian views of God were expressed in the Pauline Epistles and the early creeds , which proclaimed one God and the divinity of Jesus . Around the year 200, Tertullian formulated a version of the doctrine of the Trinity which clearly affirmed the divinity of Jesus and came close to

31146-518: The world. In Judaism, the one God of Israel is the God of Abraham, Isaac , and Jacob , who is the guide of the world, delivered Israel from slavery in Egypt , and gave them the 613 Mitzvot at Mount Sinai as described in the Torah . The national god of the Israelites has a proper name , written Y-H-W-H ( Hebrew : יהוה ) in the Hebrew Bible . The etymology of the name is unknown. An explanation of

31325-611: Was adopted by the Roman Empire as a state religion in the 4th century AD. Paul the Apostle interpreted the role of Abraham differently than the Jews of his time. While for the Jews, Abraham was considered a loyal monotheist in a polytheistic environment, Paul celebrates Abraham as a man who found faith in God before adhering to religious law. In contrast to Judaism, adherence to religious law becomes associated with idolatry. While Christians fashioned their religion around Jesus of Nazareth ,

31504-414: Was decisively dispelled by the experiments of Louis Pasteur in 1859, who expanded upon the investigations of predecessors such as Francesco Redi . Disproof of the traditional ideas of spontaneous generation is no longer controversial among biologists. Vitalism is the belief that there is a non-material life-principle. This originated with Georg Ernst Stahl (17th century), and remained popular until

31683-495: Was formulated by Henri Dutrochet , Theodor Schwann , Rudolf Virchow and others during the early nineteenth century, and subsequently became widely accepted. The activity of an organism depends on the total activity of its cells, with energy flow occurring within and between them. Cells contain hereditary information that is carried forward as a genetic code during cell division. There are two primary types of cells, reflecting their evolutionary origins. Prokaryote cells lack

31862-447: Was further developed in the period following the Babylonian captivity , eventually emerging as a firm religious movement of monotheism. With the Fall of Babylon , Judaism emphasised concepts such as messianism, belief in free will and judgement after death, conception of heaven and hell, angels and demons, among others, into their belief-system. Christianity traces back their origin to

32041-482: Was revived and revised by the French philosopher René Descartes (1596–1650), who held that animals and humans were assemblages of parts that together functioned as a machine. This idea was developed further by Julien Offray de La Mettrie (1709–1750) in his book L'Homme Machine . In the 19th century the advances in cell theory in biological science encouraged this view. The evolutionary theory of Charles Darwin (1859)

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