Which term describes a hard protein contained in the cells of the epidermis, nails, and hair that is both waterproof and a barrier to pathogens and chemicals?

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Keratin is a tough, fibrous protein that forms the main structural component of the outer layer of many animals, including humans. It is found in high concentrations in the epidermis, nails, and hair, where it provides a waterproof and protective barrier against pathogens, chemicals, and physical damage. Collagen is another type of fibrous protein that provides structural support to tissues such as skin, bones, and cartilage, but it is not waterproof or a barrier to pathogens. Melanin is a pigment that gives color to skin, hair, and eyes, and sebum is an oily substance produced by the skin's sebaceous glands to lubricate and protect the skin.

Which Term Describes a Hard Protein Contained in the Cells