When the Cenozoic era opened, the dinosaurs were was so extinct and the mammals became the dominant species life of-form. Cenozoic is called the age of the mammals. There were also major increases in the kinds of
insects, flowering grass plants, and birds. Finally, toward the end of this
period of time, humans arrived on the scene, and many other kinds of large mammals such as mammoths, mastodons, giant ground sloths, and saber-toothed
tigers went extinct.
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