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Arthropods are protected by an outer covering of a hard protein chitin, similar in function to the protein keratin in hair, nails, hooves, beaks, claws, etc., elsewhere in the animal kingdom. Some arthropods particularly marine ones further harden it through biomineralization with calcium compounds.

Because of the rigidity of the arthropod exoskeletons, they need to periodically shed it (moult) in order to grow.

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11y ago

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