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Life is considered a characteristic of something that preserves, furthers or reinforces its existence in the given environment.This characteristic exhibits all or most of the following traits: Others take a systemic viewpoint that does not necessarily depend on molecular chemistry.The criteria can at times be ambiguous and may or may not define viruses, viroids, or potential artificial life as "living".Biology is the primary science concerned with the study of life, although many other sciences are involved. The current definition is that organisms maintain homeostasis, are composed of cells, undergo metabolism, can grow, adapt to their environment, respond to stimuli, and reproduce.To survive in most ecosystems, life must often adapt to a wide range of conditions.Some microorganisms, called extremophiles, thrive in physically or geochemically extreme environments that are detrimental to most other life on Earth.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.In more detail, according to physicists such as John Bernal, Erwin Schrödinger, Eugene Wigner, and John Avery, life is a member of the class of phenomena that are open or continuous systems able to decrease their internal entropy at the expense of substances or free energy taken in from the environment and subsequently rejected in a degraded form.

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Variations of this definition include Stuart Kauffman's definition as an autonomous agent or a multi-agent system capable of reproducing itself or themselves, and of completing at least one thermodynamic work cycle.Aristotle was the first person to classify organisms.



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