Pearls are produced in an oyster around the

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(D) Pearls are formed as a natural defense mechanism by the oyster. When an external particle,such as a grain of sand,a parasite,or a piece of shell,e

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Some external particles becoming embedded in the skin of the oyster

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(D) Pearls are formed as a natural defense mechanism by the oyster. When an external particle,such as a grain of sand,a parasite,or a piece of shell,enters the oyster's mantle tissue,it causes irritation. To protect itself,the oyster secretes layers of nacre (calcium carbonate and conchiolin) around the foreign object. Over time,these layers build up to form a pearl.

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$A$: The mantle of a pearl oyster is three-layered.
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