Which of the following animals has a hard calcareous shell?

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Bivalve Explanation: • Bivalves (like mussels, clams, and oysters) are molluscs that have a body enclosed in two hard calcareous (calcium carbonate) shells. • Nereis is a soft-bodied annelid worm, a shark has a cartilaginous skeleton, and Herdmania has a tunic (test) made of tunicin, not a hard calcareous shell.

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