Exclusively marine animals which are triploblastic, exhibit radial symmetry in the adult stage and bilateral symmetry in the larval stages are placed under Phylum _____.

Annelida

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Mollusca

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Echinodermata

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Arthropoda

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Solution

The correct option is C Echinodermata
Phylum Echinodermata includes organisms which are triploblastic and are found only in oceans.Their body is triploblastic, coelomate. They are radially symmetrical in adult stage. However, they show bilateral symmetry in larval stage. For example: starfish, sea urchin.

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