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Question

Echinoderms have endoskeletons made of ossicles.

A
calcareous
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B
chlorinated
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C
sulphurous
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D
ferrous
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Solution

The correct option is A calcareous
Echinoderms are exclusively marine organisms with spiny bodies. They have an endoskeleton rich in calcium, basically made of calcareous ossicles. Ossicles are structures embedded into the body walls. They provide rigidity and protection to the body.

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