Extinction

EXTINCTION         Two-hundred and thirty million years ago the prototypal dinosaur-like cock roamed the earth. Within five million years it could be considered a dinosaur. They were soon at the top of the food chain. They inhabit solely(prenominal) continent. Then 65 million years ago they vanished. The almost powerful creatures ever to live on earth had immediate payment in ones chips extinct.         Dinosaurs were not the only victims of this mass extinction. thither were many early(a) species that were killed off. During what is cognise as the K-T extinction (K stands for Cretaceous, T stands for Tertiary), many species and families became extinct. These overwhelm either marine reptiles such as plesiosaurs, mosasaurs, ichthyosaurs, and ammonites, swimming and firm reptiles, ocean crocodiles, and foraminifera. In addition to that there were many impecunious fish, sponges, snails, clams, and sea urchins became extinct.    Â Â Â Â Â Â Paleontologists meet proposed scenarios that could have caused these extinctions. One such scenario involves the festering exposelet of sm tout ensemble mammals which ate dinosaur eggs, and therefore caused the dinosaurs kin place to drop. The birth rate became smaller than the termination rate and the dinosaurs died out. This, however, is not a plausible scenario. This would only account for the dinosaurs, plainly not all the other creatures of that time.

Paleontologists needed to come up with a much plausible and devastating theory that would allow the other creatures that died out 65 mi llion years ago.         There! have been several(prenominal) major theories that have come almost that move all be substantiated. Any one of these events, theorized by paleontologists, could have brought an determination to the dinosaurs and all the other species that died with them. Since there are many theories round this I will not write about them all. I have chosen the theory about death by Cosmic Collision (an asteroid).         In 1980 Luis Alvarez... If you want to hold fast a full essay, order it on our website: BestEssayCheap.com

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