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OpenStudy (anonymous):
Which era, characterized by the extinction of reptiles and the appearance of mammals, is considered significant in geological history?
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OpenStudy (wolfe8):
Welcome to OpenStudy. I think you can figure it out from here http://www.enchantedlearning.com/subjects/dinosaurs/mesozoic/
OpenStudy (anonymous):
b
OpenStudy (anonymous):
its B
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