The Great Cretaceous Mass Extinctio1

The Great Cretaceous Mass Extinctio1 - The Great Cretaceous...

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The Great Cretaceous Mass Extinction The sudden disappearance of the dinosaurs has long been known to paleontologists. Numerous attempts have been made to explain this, with two major ideas having the largest amounts of evidence. Sixty-five million years ago nearly 75-80% of all species of life on Earth were wiped out in an incredibly short period of time. In addition to dinosaurs, pterosaurs, belemnoids, many species of plants (such as the plant that produced Aquilapollenites type pollen), ammonites, marine reptiles, and rudist bivalves also disappeared. Among the various hypotheses to explain the extinction that closed the Mesozoic era were allergies by dinosaurs to pollen produced by flowering plants, increased radiation levels that led to male dinosaur sterility, diseases brought by migrating animals, and a gradual climate deterioration that the dinosaurs were unable to cope with. The first hypothesis ignores the fact that flowering plants and dinosaurs had coexisted for over 70 million years at the time of the mass extinction. Increased
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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