About 66 million years ago, many of the Earth's species went extinct, including all species of dinosaurs. The catalyst for this mass-extinction is still a mystery; while many theories have been proposed, none has been confirmed. That being said, substantial evidence has led many scientists to believe that the primary cause of the extinction was an asteroid impact, but several prominent paleontologists have detracted from this theory. Some of these detractors believe that volcanic activity was the primary catalyst of the extinction.
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