Many animals exist today in a form that is almost identical to the form they had a million years...

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Many animals exist today in a form that is almost identical to the form they had a million years ago. What is the most probable explanation for this lack of evolutionary change?
(a) Genetic mutations have occurred among these animals.
(b) The environment of these animals remained about the same.
(c) These animals reproduce by sexual reproduction.
(d) Complex organisms evolved into simpler ones.
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