The skeleton in the case of echinoderms is made up of:

Silica

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Calcium carbonate

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Sodium carbonate

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Spongin fibre

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Solution

The correct option is B Calcium carbonate
Echinoderms are spiny-skinned organisms. They are exclusively marine invertebrates. They have a calcareous endoskeleton made up of calcium carbonate plates.
Thus, the correct answer is option B.

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