What major event most likely spurred mammal diversification? mass extinction of the dinosaurs warm climate first flowering plants first primates?

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What major event most likely spurred mammal diversification? mass extinction of the dinosaurs warm climate first flowering plants first primates?

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The answer is a mass extinction of the dinosaurs.
65 million years ago mass extinction of dinosaurs prompted mammal diversification. Before that, dinosaurs were large reptiles that lived on Earth. They had many ecological niches. But, after extinction, they made room for other animals, such as mammals, to evolve and diversify rapidly.