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मोती (पर्ल) एक मोलस्क के मृदु ऊतकों में उत्पन्न होने वाला एक कठोर पदार्थ है। निम्नलिखित में से कौन-सा मोती का मुख्य घटक है?

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मोती (पर्ल) एक मोलस्क के मृदु ऊतकों में उत्पन्न होने वाला एक कठोर पदार्थ है। निम्नलिखित में से कौन-सा मोती का मुख्य घटक है?






 
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