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During which period did mammals first appear? A. Pleistocene B. Carboniferous C. Cretaceous D. Jurassic
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During which period did mammals first appear? A. Pleistocene B. Carboniferous C. Cretaceous D. Jurassic

User Shandel
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D.........The Jurassic Period.
User Elya
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D JURASSIC PERIOD BECAUSE THEY CAME UP WHEN DINOSAURS CAME
User Shiroko
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