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The top documents tagged [ordovician extinction]
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ordovician extinction
Chapter 23 Review The Paleozoic, Mesozoic, and Cenozoic Eras.
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Earth History The Paleozoic Era. Paleozoic Time (544 - 245 Million Years Ago) n Bracketed by the two most important biological events in Earth’s history:
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Paleobiology and Macroevolution Ch. 22.1-22.5
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