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OpenStudy (anonymous):
During which period did mammals first appear? a. Pleistocene b. Carboniferous c. Cretaceous d. Jurassic
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OpenStudy (anonymous):
The first mammals that are considered "true" mammals appeared in the Jurassic.
OpenStudy (anonymous):
jurassic... So1D is correct
OpenStudy (anonymous):
Thank you :)
OpenStudy (anonymous):
very welcome!! :)
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