1.The Great Paleozoic Extinction The formation of Pangea resulted in a much dryer climate.By the end Permian 57% of the amphibian families declined and plants decreased in…

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Slide 1 13 Chapter 13 Earth’s History Slide 2 Precambrian History 13.1 Precambrian Time  4.56 billion years ago until the start of the Cambrian period, over 4 billion…

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