Calcareous shell present in
a. Echinodermeta b. Mollusca
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b. Mollusca
The mollusc (or mollusk) shell is typically a calcareous exoskeleton which encloses, supports and protects the soft parts of an animal in the phylum Mollusca, which includes snails, clams, tusk shells, and several other classes.
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b. molluscs is correct answer
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