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Hysys.base.eth
@hysys
When a foreign object such as a particle of sand is placed between the shell and the shell, the animal secretes layers composed of the horn organic substance conchiulin and calcite or aragonite crystals around the foreign object.A pearl is gradually formed from these concentric layers.Your life is as nice as this pearl
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Mostafa2026
@mostafa2026
Very good
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