What are horns,nails,and hooves made of?

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(D) Horns,nails,and hooves are composed of a tough,fibrous structural protein known as $Keratin$.$Keratin$ is a type of scleroprotein that provides st

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Keratin

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(D) Horns,nails,and hooves are composed of a tough,fibrous structural protein known as $Keratin$.$Keratin$ is a type of scleroprotein that provides strength and protection to these epidermal derivatives in vertebrates.$Cuticle$ is a protective layer on plants or insects,$Chitin$ is found in the exoskeleton of arthropods,and $Tunicin$ is found in the test of tunicates.

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