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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
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OpenStudy (benlindquist):
This is a quiz?
OpenStudy (anonymous):
Yes
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