• No one knows how or when life first began on the turbulent early Earth.
  • Scientists think that it is extremely likely that life began and was wiped out.
  • For something to be alive it must be organic, have a metabolism, and be capable of replication.
  • To learn about the origins of life, scientists perform experiments.
  • They study creatures that live in extreme environments.
  • They look for traces of life that were left by ancient microbes.
  • These include microscopic features or chemistry left by life.
  • It is very difficult to distinguish these from non-biological features.
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