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Over the years, the irritating object is covered with enough layers of nacre to become a pearl.

A small, three-chambered heart, lying under the adductor muscle, pumps colorless blood to all parts of the body.These pearls are not as valuable as natural pearls, but look exactly the same.In fact, since the beginning of the 20th century, when several researchers discovered how to produce artificial pearls, the cultured pearl market has far outgrown the natural pearl market.While some oysters have two sexes (European oyster and Olympia oyster), their reproductive organs contain both eggs and sperm.Because of this, it is technically possible for an oyster to fertilize its own eggs.

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