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How can divisions of periods in history be considered meaningful? |
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Answer» ong>Answer: How is time divided in history? Eons are made up of eras, divisions that span time periods of tens to HUNDREDS of millions of years. The THREE major eras are the Paleozoic, the Mesozoic, and the Cenozoic. The Cenozoic era is the one we are in TODAY. It BEGAN 65 million years ago, right about the time that the dinosaurs went extinct.D |
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