Which among the following is not the feature of Echinoderms?

Calcareous shell exoskeleton

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Animals are mostly unisexual

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Adults are radially symmetrical

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Ability of regeneration

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Solution

The correct option is A Calcareous shell exoskeleton
Echinoderms have calcareous spines all over their body, hence they are called Echinoderms. These animals have an endoskeleton of calcareous ossicles. They exhibit radial symmetry in adult stage. However, in the larval stage they show bilateral symmetry. Also, these animals have good ability of regeneration and are mostly unisexual.

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