Mammals first appeared during the ______. a. Cenozoic Era c. Mesozoic Era b. Paleozoic Era d. Cretaceous Period

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Mammals first appeared during the ______. a. Cenozoic Era c. Mesozoic Era b. Paleozoic Era d. Cretaceous Period

Mammals first appeared during the Mesozoic Era.

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Asked 11/13/2015 3:40:34 PM

Updated 11/14/2015 6:34:12 AM

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Confirmed by selymi [11/14/2015 6:34:12 AM]

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The amount of fuel used to heat and cool your home can be reduced by good ______.

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