what is calcareous shell..
explain briefly..
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Calcareous shell is the hard exoskeleton which provides protection to the organisms.
A calcareous shell is a covering mostly made up of calcium carbonate. It forms the exoskeleton of molluscs and protects and supports their soft body parts.
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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