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OpenStudy (anonymous):
A mass extinction at the end of the ______ Period ended the age of the dinosaurs. a. Quaternary b. Cretaceous c. Jurassic d. Permian
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OpenStudy (ashleyisakitty):
I believe it was at the ned of the Cretaceous period, which was about 65 million years ago.
OpenStudy (anonymous):
Thank you
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