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(C) Pearl formation is a biological process that occurs in certain mollusks,primarily bivalves. Among the given options,$Pinctada$ (commonly known as

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Pinctada

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(C) Pearl formation is a biological process that occurs in certain mollusks,primarily bivalves. Among the given options,$Pinctada$ (commonly known as the pearl oyster) is the genus most widely used in the commercial production of pearls. When an irritant,such as a grain of sand or a parasite,enters the mantle of the oyster,the mollusk secretes layers of nacre (calcium carbonate) around the irritant to protect its soft tissues,eventually forming a pearl.

Which of the following is associated with the formation of a pearl?

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