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Q.

Which of the following set of cnidarians or corals have skeleton composed of calcium carbonate?

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a

Velella, Physalia, Hydra

b

Aurelia, Obelia, Physalia
 

c

Pennatula, Gorgonia, Meandrina
 

d

Hydra, Adamsia, Porpita

answer is B.

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Detailed Solution

Pennatula, Gorgonia, Meandrina are set of cnidarians which are all corals.

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