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In phylum echinodermata, the adult echinoderms are ______A__________ but larvae are _______B______ .

A. A radially symmetrical; B bilaterally symmetrical

B. A bilaterally symmetrical; B radially symmetrical

C. A bilaterally symmetrical; B asymmetrical

D. A metamerically segmented; B asymmetrical

Correct Answer : A.


Echinoderms are a phylum of marine animals. The adults are recognizable by their (usually five-point) radial symmetry, whereas the larvae are bilaterally symmetrical. For example starfish, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies or stone lilies.

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