The Scientific Controversy Over the Cambrian Explosion

Since the abruptness and extensiveness of the Cambrian explosion are so well documented, there is no excuse for a biology textbook to deal with the animal fossil record without even mentioning it. Furthermore, since some biologists maintain that the Cambrian explosion presents a challenge -- or at least a "paradox" -- for one of the fundamental tenets of Darwin's theory, any biology textbook that doesn't discuss that challenge fails to provide students with the resources to think critically about the most widely taught scientific explanation for evolution.

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