Weegy: During the Cretaceous-Paleogene extinction approximately 75% of all life forms on Earth became extinct.
User: the cenozoic era mass extinction of many animals have an opportunity for blank to fill the ecological positions that has previously been filled by dinosaurs
Weegy: The Cenozoic Era mass extinction of many animals gave an opportunity for MAMMALS to fill the ecological positions that had previously been filled by [ dinosaurs.
]
User: primates and early humans appeared later during the neogene and blank periods
Weegy: Primates and early humans appeared later during the Neogene and Cenozoic Era [ Periods.
]
User: the cenozoic era experienced a series of ice ages, and specifically during the blank ice ages
Weegy: When glaciers advanced south, so did plants and animals reduced living space and food availability.
User: the cenozoic era experienced a series of ice ages, and specifically during the blank ice ages the glaciers advanced and retreated four times
Weegy: The Cenozoic Era experienced a series of ice ages, and specifically, during the Pleistocene ice ages the glaciers advanced and retreated four times.
User: the cascade mountains were formed in the cenozoic by the geologic process of along the western edge of north american continent
Weegy: The Cascade Mountains were formed in the Cenozoic by the geologic process of volcanic activity along the western edge of North American continent.
User: describe how life was affected on earth during the cretaceous period when an asteroid struck the yucatán peninsula in mexico
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