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What structure does phylum Cnidaria have that no other phylum does?

User Vasek
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Step-by-step explanation:

Cnidarians are radially symmetrical (i.e., similar parts are arranged symmetrically around a central axis). They lack cephalization (concentration of sensory organs in a head), their bodies have two cell layers rather than the three of so-called higher animals, and the saclike coelenteron has one opening (the mouth).

User Techtabu
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