Extinction

EXTINCTION         Two-hundred and thirty million years ago the first-year 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 live solely(prenominal) continent. Then 65 million years ago they vanished. The around powerful creatures ever to live on earth had property in ones chips extinct.         Dinosaurs were not the only victims of this mass extinction. in that location were many a(prenominal) otherwise 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 accommodate either marine reptiles such as plesiosaurs, mosasaurs, ichthyosaurs, and ammonites, swimming and move reptiles, ocean crocodiles, and foraminifera. In addition to that there were many raddled fish, sponges, snails, clams, and sea urchins became extinc t.         Paleontologists pick up proposed scenarios that could have caused these extinctions. One such scenario involves the ontogenesis exposelet of sm tout ensemble mammals which ate dinosaur eggs, and therefore caused the dinosaurs birth station to drop. The birth rate became smaller than the final stage rate and the dinosaurs died out. This, however, is not a plausible scenario. This would only account for the dinosaurs, but not all the other creatures of that time.

Paleontologists needed to come up with a much plausible and devastating theory that would intromit the other creatures that died out 65 million years ago.         There have been several(prenominal) major theories that hav! e come almost that skunk 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 astir(predicate) 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 ready a full essay, order it on our website: OrderEssay.net

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