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Sponges

Primitive multicellular organisms that do not move and only have cellular organization, more like a single tissue.

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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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