Extinction of Dinosaurs


Ryan Humphries
Biology
6th Period


Two-hundred and thirty million years ago the first dinosaur-like
creature roamed the earth. Within five million years it could be considered a
dinosaur. They were soon at the top of the food chain. They populated every
continent. Then 65 million years ago they vanished. The most powerful
creatures ever to live on earth had become extinct.
Dinosaurs were not the only victims of this "mass extinction." There
were many other species that were killed off. During what is known as the K-T
extinction (K stands for Cretaceous, T stands for Tertiary), many species and
families became extinct. These include all marine reptiles such as plesiosaurs,
mosasaurs, ichthyosaurs, and ammonites, swimming and flying reptiles, sea
crocodiles, and foraminifera. In addition to that there were many bony fish,
sponges, snails, clams, and sea urchins became extinct.
Paleontologists have proposed scenarios that could have caused these......

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Title: Extinction Of Dinosaurs
Approximate Word Count: 664
Approximate Pages: 3 (250 words per double-spaced page)

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