Mammals first appeared during the ______. a. Cenozoic Era c. Mesozoic Era b. Paleozoic Era d. Cretaceous Period Please select the best answer from the choices provided

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Unit Test

Mammals first appeared during the ______. a. Cenozoic Era c. Mesozoic Era b. Paleozoic Era d. Cretaceous Period Please select the best answer from the choices provided

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