(C) Secondary radial symmetry is found in phylum-$Echinodermata$. The members of this phylum are exclusively marine forms. In these organisms,the larv

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(C) Secondary radial symmetry is found in phylum-$Echinodermata$. The members of this phylum are exclusively marine forms. In these organisms,the larvae exhibit bilateral symmetry,but during metamorphosis,the symmetry of the adults usually changes to pentamerous radial symmetry.