EXTINCTION Â Â Â Â Â Â Â Â Two-hundred and thirty jillion days ago the first dinosaur-like pecker roamed the earth. Within five unrivaled thousand million historic period it could be considered a dinosaur. They were soon at the coron return of the food chain. They populated solely(prenominal) continent. hence 65 million years ago they vanished. The well-nigh sinewy creatures ever to live on earth had cash in ones chips extinct. Â Â Â Â Â Â Â Â Dinosaurs were non the exclusively victims of this mass extinction. in that respect were many new(prenominal) species that were killed off. During what is sleep together as the K-T extinction (K stands for Cretaceous, T stands for Tertiary), many species and families became extinct. These include every marine reptiles such as plesiosaurs, mosasaurs, ichthyosaurs, and ammonites, swimming and flying reptiles, marine crocodiles, and foraminifera. In addition to that on that point were many bony fish, sponges, snails, clams, and ocean urchins became extinct. Â Â Â Â Â Â Â Â Paleontologists have proposed scenarios that could have caused these extinctions. ane such scenario involves the growing exposelet of sm tout ensemble mammals which ate dinosaur eggs, and at that placefore caused the dinosaurs consanguinity aim to drop. The birth rate became sm altogetherer than the death rate and the dinosaurs died out. This, however, is non a plausible scenario. This would only account for the dinosaurs, but non all the other creatures of that time.
Paleontologists infallible to arise up with a much plausible and annihilative surmise that would include the other creatures that died out 65 million years ago. Â Â Â Â Â Â Â Â There have been several(prenominal) major theories that have come almost that can all be substantiated. Any one of these events, theorized by paleontologists, could have brought an tendency to the dinosaurs and all the other species that died with them. Since there are many theories slightly this I will not write about them all. I have chosen the theory about death by Cosmic Collision (an asteroid). Â Â Â Â Â Â Â Â In 1980 Luis Alvarez... If you want to get a full essay, order it on our website: Ordercustompaper.com
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