 Sci-Ed Fact: What is Evolution? Evolution is
usually defined either as the adaptation of species to their
surrounding environment(s) over time or as the theory that life
on Earth gradually developed from simple to more complex organisms.
In fact, all organisms on the Earth today are the products of
billions of years of evolution -- from single-celled bacteria
to the most advanced animals. Life may have started and died
out several times before it became permanently established. The
oldest known evidence of life has been found in 3.8 billion year
old Greenland rock; the oldest known fossil evidence are organisms
similar to blue-green algae founed in Australia and estimated
to be about 3.5 billion years old. (The
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