Use the unlabeled clock diagram below to test your memory
Chapter 25, Problem 25.29(choose chapter or problem)
Use the unlabeled clock diagram below to test your memory of the sequence of key events in the history of life described in this chapter by labeling the colored bars. As a visual aid to help you study, add labels that represent other significant events, including the Cambrian explosion, origin of mammals, and Permian and Cretaceous mass extinctions.
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