Horns nails and hoofs are made of

Cuticle

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Chitin

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Tunicin

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Keratin

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Solution

The correct option is D Keratin
Keratin is the type of tough and insoluble fibrous structural proteins that form the hard nonmineralized structural component of hair, wool, horns claws, hooves. it is produced by the epithelial cells. Hence, option D is correct.

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