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In phylum Echinodermata, the adult echinoderms are ___A_ but larvae are _B__.
A B
1 radially symmetrical bilaterally symmetrical
2 bilaterally symmetrical radially symmetrical
3 bilaterally symmetrical asymmetrical
4 metamerically segmented asymmetrical

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answer is A.

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Detailed Solution

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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