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

Echinodermata

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Porifera

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Arthropoda

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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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