Natural pearl is formed by

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(A) Natural pearls are produced by certain mollusks,specifically bivalves such as oysters and mussels.When a foreign particle,such as a grain of sand

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$A$ bivalve

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(A) Natural pearls are produced by certain mollusks,specifically bivalves such as oysters and mussels.When a foreign particle,such as a grain of sand or a parasite,enters the mantle cavity of the bivalve,the animal secretes layers of nacre (calcium carbonate) around the irritant to protect its soft tissues.Over time,these layers accumulate to form a pearl.

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