1. EVIDENCE FOR THE THEORY OF EVOLUTION
2. Geographical Distribution
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The Cretaceous Period ended with a mass extinction.
More than half of all plant and animal groups were wiped out, including all of the dinosaurs.
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Geographical Distribution
Similar, But Unrelated Species
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The existence of similar but unrelated species was a puzzle to Darwin. Later, he realized that similar animals in different locations were the product of different lines of evolutionary descent. Here, the beaver and the capybara are similar species that inhabit similar environments of North America and South America. The South American coypu also shares many characteristics with the North American muskrat.
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