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OpenStudy (anonymous):
Which group of animals evolved first? A. echinoderms B. chordates C. flatworms D. cnidarians
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OpenStudy (dominantvampire):
the first life was prokaryotic cells like archaia and bacteria next was single celled eukaryotic cells like amoeba. Then came mulit-celled amimals like; sponge-like animals, cnidarians, and worms
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