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Mojtaba
@mojifrmrzii
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.
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emir93🎭
@happpyyy
tnx for your useful information 116 $DEGEN
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