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Cnidarians

Animals that exhibit radial symmetry, tissues but no organs and possess stinging cells called nematocysts.

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Invertebrates: Species Study Guide
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This study guide summarizes the ecology, body structure, and reproduction of sponges, cnidarians, flatworms, roundworms, mollusks, annelids, arthropods, insects, and echinoderms. It also includes further classification of arthropods and echinoderms.
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