The same reptiles were present on all continents during the Mesozoic Era, but the mammals of the

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The same reptiles were present on all continents during the Mesozoic Era, but the mammals of the Cenozoic Era were often different on different continents. Why?

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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