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Mathematics 21 Online
OpenStudy (anonymous):

I need help on a Science quiz! Will medal! During which geological time period did ice-age mammals appear? A. Cenozoic era, Quaternary period B. Mesozoic era, Cretaceous period C. Precambrian era, Ordovician period D. Paleozoic era, Permian Period

OpenStudy (benlindquist):

This is a quiz?

OpenStudy (anonymous):

Yes

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