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Extinction Of Dinosaurs Beginning of Paper 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 the .... Middle of Paper .... mammals which ate dinosaur eggs, and therefore caused the dinosaurs' birth rate to drop. The birth rate became smaller than the death 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 more plausible and devastating theory that would include the other creatures that died out 65 million years ago. There have been several major theories that have come about that can all be substantiated. .... 684 words | 3 pages Subscription Length Price Join 30 days membership (recurring) $19.95 90 days membership (recurring) $39.95 180 days membership (non-recurring) $69.95