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Essay heading: The Cretaceous ? Tertiary Boundary (k-t) Extinction
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Humanities |
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June 11, 1997 |
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9 / 2467 |
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The K-T Extinction is an event that happened at the end of this period 65 million years ago. By the beginning of the Tertiary period eighty-five percent of all species disappeared, making it the second largest mass extinction event in geological history ("The End-Cretaceous (K-T) Extinction", accessed 2000)...
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Severely affected organisms included planktic foraminifera, calcareous nannnoplankton, diatoms, dinoflagellates, brachiopods, mollusca, echinoids and fish. Mammals, birds, turtles, crocodiles, lizards, snakes and amphibians fared much better and were mostly unaffected by the End-Cretaceous mass extinction ("The End-cretaceous (K-T) Extinction", accessed 2000)...
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