Which happened during the Paleozoic era? A. Sponges and invertebrates dominated the seas. B. Bony fish evolved. C. No life was present yet on earth. D. Bacteria were the dominant life-forms.

Which happened during the Paleozoic era?

A. Sponges and invertebrates dominated the seas.

B. Bony fish evolved.

C. No life was present yet on earth.

D. Bacteria were the dominant life-forms.

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