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What was the most significant geologic event of the Mesozoic?A. break up of a supercontinentB. "explosion" of many new life formsC. mass extinctionD. creation of a supercontinent

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During the Mesozoic, approximately 66 million years ago, a large meteorite crashed into the Gulf of Mexico. This event caused a massive tsunami and a climate disruption, leading to the death of up to 80% of the world's animal and plant species. Therefore, the correct answer is C. mass extinction.

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