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The Cenozoic Era, spanning approximately 66 million years ago to the present, is the most recent of the three major subdivisions of Earth's history and is profoundly significant in the context of human evolution. It follows the Mesozoic Era and is often termed the "Age of Mammals" due to the dramatic diversification and dominance of mammals during this period. The Cenozoic is divided into three major periods: Paleogene, Neogene, and Quaternary, each marked by critical evolutionary and environmental events that shaped the path of hominin development. In the Paleogene period (66–23 million years ago), the extinction of non-avian ______ ____ ____ ______ ___.
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