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Which of the following have skeleton composed of calcium carbonate?

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Ctenoplana, Physalia, Hydra

Hydra, Sycon, Ctenoplana.

Meandrina, Sycon, Pila

Aurelia, Physalia, Obelia

answer is B.

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Detailed Solution

A calcareous skeleton is present in calcareous sponges (e.g., Sycon), cnidarian corals (e.g., Meandrina) and molluscs (e.g., Pila).

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