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In what geological era did mammals expand on Earth? A.)Cenozoic B.)Mesozoic C.)Paleozoic D.)Phanerozoic
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In what geological era did mammals expand on Earth?

A.)Cenozoic B.)Mesozoic C.)Paleozoic D.)Phanerozoic

User Sanxofon
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a i think because the web site i went said it was

User Jaswant Agarwal
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