Q.

Which of the following has an endoskeleton of calcareous ossicles?

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a

Aplysia

b

Ascidia

c

Asterias

d

Ascaris

answer is C.

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Detailed Solution

Echinoderms (e.g., Asterias) have an endoskeleton of calcareous ossicles, which bear spines and hence the name spiny-bodied animals.
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Which of the following has an endoskeleton of calcareous ossicles?