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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
Student Contributed
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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