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Question

Which among the following contains hard calcium carbonate structures as the constituent part of their skeleton?

A
Echinodermata
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B
Porifera
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C
Arthropoda
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D
Nematoda
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Solution

The correct option is A Echinodermata
The echinoderms are spiny-skinned organisms, which are exclusively free-living and marine. They are triploblastic and coelomate.
They have a water-driven tube system for locomotion.
The body consists of calcium carbonate structures that they use as skeletons.
E.g., Sea urchins, starfish.

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