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"One of the great mysteries in science is the extinction of the dinosaurs at the end of the Mesozoic Era some 65 million years ago. Who (or more likely what) caused it is unknown and a subject of great debate." Many theories are touched on in this article, but it concentrates on the asteroid theory.
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- Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)
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