Which phylum includes members that have radial symmetry and nematocysts, and may have polyp or medusa forms (or both) as adults?

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The phylum Cnidaria includes members such as jellyfish and coral that have radial symmetry and nematocysts for defense and feeding. They also have a polyp form (stationary) and/or medusa form (free-swimming) as adults. The other choices do not fit this description.

Which Phylum Includes Members That Have Radial Symmetry and Nematocysts