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Phylum Echinodermata

Hard calcium ...

Question

Hard calcium carbonate structures are used as skeleton by_______________.

A

Echinodermata

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B

Protochordata

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C

Arthropoda

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D

Nematoda

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Solution

The correct option is A Echinodermata
The body wall of Echinodermata is covered with spiny, hard, calcareous (calcium carbonate) plates (ossicles) that form a rigid or flexible endoskeleton.
So, the correct answer is option A.

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