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The animal with bilateral symmetry in young stage and radial pentamerous symmetry in the adult stage belong to the phylum
A. Annelida
B. Mollusca
C. Cnidaria
D. Echinodermata

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Correct Answer - D
Echinoderms are triploblastic animals with organ system level of organisation . Lerval forms possess bilateral symmetry while adults have radial symmetry.

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