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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.Though currently only known on Earth, life need not be restricted to it, and many scientists speculate 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.

Cells are sometimes considered the smallest units and "building blocks" of life.Life is a characteristic that distinguishes physical entities that do have biological processes, such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased, or because they never had such functions and are classified as inanimate.Various forms of life exist, such as plants, animals, fungi, protists, archaea, and bacteria.Earth's current life may have descended from an RNA world, although RNA-based life may not have been the first.The mechanism by which life began on Earth is unknown, though many hypotheses have been formulated and are often based on the Miller–Urey experiment.

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