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The shells of shrimp, clams, and crabs are primarily composed of a biopolymer called chitin, which is a tough, flexible substance. In crustaceans like shrimp and crabs, the chitin is often mineralized with calcium carbonate, providing additional strength and rigidity. Clam shells, on the other hand, are mostly made of calcium carbonate in the form of aragonite or calcite, giving them their hard and durable structure. Together, these materials provide protection and support for these marine animals.

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2w ago

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