Echinoderms are exclusively

Marine

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Riverine

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Estuarine

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Fresh water

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Solution

The correct option is A Marine
Echinoderms are a phylum of exclusively marine animals.
They are the largest phylum that has no freshwater or terrestrial representatives.
These are radially symmetrical. These have a water canal system and has a spiny skeleton.

Therefore, the correct answer is option A.

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