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Terrestrial Origins and Evolution
Two of the most important events in the history of animal life occurred during the
Paleozoic. First was the Cambrian explosion, where almost all living animal phyla
known today appeared in just a few million years. Then, at the end of the Paleozoic,
the largest mass extinction in history wiped out approximately 90 percent of all
marine animal species.
Credit: UC Berkeley
01/14/09

 



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