Nails, horns, the scales on the back of a scaly anteater (pangolin) and the scales on the tail of rat are:

Derivative of keratinized epidermal material.

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Homologous structures.

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Both (A) and (B).

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Secretions from special skin glands.

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Solution

The correct option is D Both (A) and (B).
Pangolins also known as the scaly ant eaters are mammals belonging to the order Pholidot. These are characterized by large, protective keratinized scales that cover the skin. Keratin is also the key structural component of nails, horns, hooves, claws of mammals as well as the nails, scales and claws of reptiles.

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