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OpenStudy (anonymous):
The change in environments that may have occurred at the end of the Paleozoic Era may have been caused by __
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OpenStudy (anonymous):
change
OpenStudy (rina.r):
By culminating of glacial period and by extinction of some great animals (mastodons, marmots). As far as the extinction is concerned it could be caused partially by humans. http://answers.yahoo.com/question/index?qid=20120613075855AAKJUMP
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