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During the Cretaceous-Paleogene extinction approximately of all life forms on Earth became extinct.
The Cenozoic Era mass extinction of many animals gave an opportunity for to fill the ecological positions that had previously been filled by dinosaurs.
Primates and early humans appeared later during the Neogene and Periods.
The Cenozoic Era experienced a series of ice ages, and specifically during the ice ages the glaciers advanced and retreated four times.
The Cascade Mountains were formed in the Cenozoic by the geologic process of along the western edge of North American continent.
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During the Cretaceous-Paleogene extinction approximately of all life forms on Earth became extinct....
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