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Mollusca- Bivalvia

Pearls form when an irritant, such as a grain of sand or a parasite, enters the soft tissue of a mollusk, like an oyster or a mussel. In response to the irritant, the mollusk secretes layers of nacre, a combination of calcium carbonate and protein, around the irritant. Over time, these layers build up, forming a lustrous pearl. The quality, size, shape, and color of the pearl depend on various factors, including the type of mollusk, the size of the irritant, and the environmental conditions. Pea

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