Which phylum includes members that have bilaterally symmetrical larvae but exhibit secondary radial symmetry as adults, usually organized around five rays, or "arms"?

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Echinodermata is the phylum that includes organisms which have bilaterally symmetrical larvae but exhibit secondary radial symmetry as adults, typically organized around five rays or "arms." Examples include starfish and sea urchins.

Which Phylum Includes Members That Have Bilaterally Symmetrical Larvae but Exhibit