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OpenStudy (purple_pink):
Which happened during the Paleozoic era? A. Bacteria were the dominant life-forms. B. Bony fish evolved. C. Sponges and invertebrates dominated the seas. D. No life was present yet on earth.
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OpenStudy (mvpriest):
A.
OpenStudy (mvpriest):
or B. but probably A.
OpenStudy (purple_pink):
which one
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