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What is the eon, era and period of the first mammals?​
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What is the eon, era and period of the first mammals?​

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1. About 200 million years ago, 2. Cenozoic era, 3. The period between the extinction of the dinosaurs and the present day is called the Age of Mammals or Cenozoic. Mammals appeared on the earth long before the extinction of the dinosaurs
User Gurbela
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