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If the significant events of the Cenozoic era, such as the rise of mammals and birds, the development of grasslands, and the formation of the modern continents, did not occur, the Earth's biodiversity and ecological landscapes would be drastically different. Mammals may not have become the dominant terrestrial vertebrates, possibly allowing reptiles or amphibians to thrive instead. Additionally, the absence of flowering plants and grasslands would lead to diminished herbivore populations, altering food webs and ecosystems. Overall, the evolutionary trajectory of life on Earth would be profoundly impacted, potentially resulting in a less diverse biosphere.

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3d ago

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