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OpenStudy (anonymous):

Which evolved during the Paleozoic Era? A. earth’s first land plants B. the first humans C. bacteria that could produce oxygen D. saber-toothed cats

OpenStudy (anonymous):

Halp!

OpenStudy (truwhovian11):

A. the first land plants

OpenStudy (misssmartiez):

http://www.ucmp.berkeley.edu/help/timeform.php It has helped me with my portfolio due to the geologic time scales, and it has that era included.

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