The Cenozoic era is considered the age of mammals due to the vast diversification that took place.

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The Cenozoic era, which began around 66 million years ago and continues to the present day, is commonly known as the age of mammals due to the significant diversification of mammal species that occurred during this period. Prior to the Cenozoic era, the dominant land animals were dinosaurs and other reptiles.

The Cenozoic Era Is Considered the Age of Mammals Due