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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.Aristotle was the first person to classify organisms.
Since there is no unequivocal definition of life, most current definitions in biology are descriptive.
Though currently only known on Earth, life need not be restricted to it, and many scientists believe in the existence of extraterrestrial life.
Artificial life is a computer simulation or man-made reconstruction of any aspect of life, which is often used to examine systems related to natural life.
Properties common to all organisms include the need for certain core chemical elements to sustain biochemical functions.
Life on Earth probably arose between 3.8 and 4.1 billion years ago.
Eventually new groups and categories of life were discovered, such as cells and microorganisms, forcing dramatic revisions of the structure of relationships between living organisms.
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