The Cambrian explosion was
A.
a mass extinction at the end of the Cambrian period.
B.
a burst of animal diversity that occurred about 550 million years ago.
C.
distinguished by large numbers of dinosaurs.
D.
the first appearance of early mammals.
The Cambrian explosion was B. a burst of animal diversity that occurred about 550 million years ago. [smile]
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Asked 6/13/2012 1:01:30 PM
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