Extinction

EXTINCTION         Two-hundred and thirty million years ago the inaugural 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 be solely(prenominal) continent. Then 65 million years ago they vanished. The virtually powerful creatures ever to live on earth had hard currency in ones chips extinct.         Dinosaurs were not the only victims of this mass extinction. on that point were numerous another(prenominal) 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 let in either marine reptiles such as plesiosaurs, mosasaurs, ichthyosaurs, and ammonites, swimming and debauched reptiles, ocean crocodiles, and foraminifera. In addition to that there were many lean fish, sponges, snails, clams, and sea urchins became extinct.         Paleontologists nominate proposed scenarios that could have caused these extinctions. One such scenario involves the increment exposelet of sm tout ensemble mammals which ate dinosaur eggs, and therefore caused the dinosaurs blood number to drop. The birth rate became smaller than the devastation rate and the dinosaurs died out. This, however, is not a plausible scenario. This would only account for the dinosaurs, tho not all the other creatures of that time.

Paleontologists needed to come up with a much plausible and devastating theory that would embroil the other creatures that died out 65 million yea rs ago.         There have bee! n several(prenominal) major theories that have come almost that nominate 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 intimately 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 specify a full essay, order it on our website: BestEssayCheap.com

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