1.
The text claims that the fossil record is biased in several ways. What are these biases? If the database is biased, is it still an effective tool to use in studying the diversification of life? Explain.
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2.
The initial radiation of animals took place over some 40 million years, at the start of the Cambrian period. Why is the radiation called an "explosion?"
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3.
What is the "new genes, new bodies" hypothesis? Based on the data presented in this chapter, is the hypothesis correct?
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4.
Give an example of an adaptive radiation that occurred after a colonization event, a mass extinction, and a morphological innovation. In each case, provide a hypothesis for why the adaptive radiation occurred.
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5.
Summarize the evidence that supports the impact hypothesis for the K-T extinction.
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