Definition of life

This article is about the general concept. For whether a human is alive or dead, see Beginning of human personhood and Legal death.

The precise definition of life is a contested aspect of it, and several proposals have been advanced. Biology defines and studies life as we know it, but abiogenesis and astrobiology seek wider and more encompassing definitions. Abiogenesis is the process by which life develops from inorganic materials, so a definition aims to establish the frontier between inorganic matter and the earliest lifeforms. Astrobiology seeks extraterrestrial life, which may differ from life on Earth.

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