What is evolution?
Evolution is a continuously substantiated theory that all living things have descended with modification
from ancestral organisms in a long process of adaptive change. These changes have produced the organisms
that have become extinct as well as the diverse forms of life that exist today. Although the pace of
evolutionary changes in the structure, function, and behavior of groups of organisms is generally thought
to be constant when viewed over very long periods of time, lively debate has ensued about the tempo of
change when examined over shorter periods. The rate of change may not always be even but may occur
in rapid bursts, and such abrupt changes have, in fact, been observed in some organisms.
Evolution is a continuously substantiated theory that all living things have descended with modification
from ancestral organisms in a long process of adaptive change. These changes have produced the organisms
that have become extinct as well as the diverse forms of life that exist today. Although the pace of
evolutionary changes in the structure, function, and behavior of groups of organisms is generally thought
to be constant when viewed over very long periods of time, lively debate has ensued about the tempo of
change when examined over shorter periods. The rate of change may not always be even but may occur
in rapid bursts, and such abrupt changes have, in fact, been observed in some organisms.
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