Which one of the following is not applicable to echinoderms?

Presence of echinoderms

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Exclusively found in fresh water

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Variable larval forms

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Showing secondarily adapted radial symmetry

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Solution

The correct option is B Exclusively found in fresh water
Echinoderms are a phylum of marine animals. The larvae of echinoderms are bilaterally symmetrical while they undergo metamorphosis and the adults are recognisable by their radial symmetry like starfish, sea urchins, sand dollars and sea cucumbers. So, adults have secondarily adapted symmetry.
Therefore, the correct answer is option B.

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