The invertebrates have varied types of organs for locomotion and the lower invertebrates lack any such organs. The cnidarians or the coelenterates are the third phylum. The cnidarians are aquatic and range in size from small microscopic to large-sized animals. The cnidarians lack proper locomotory organs.

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Chapter 24, Problem 5SQ

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Concept introduction: The invertebrates have varied types of organs for locomotion and the lower invertebrates lack any such organs. The cnidarians or the coelenterates are the third phylum. The cnidarians are aquatic and range in size from small microscopic to large-sized animals. The cnidarians lack proper locomotory organs.

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