Identify the primary substance that composes a layer of the epidermis,is responsible for hardening nails and hair,and protects the body from fluid loss and invasion by pathogens.

Question

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The epidermis is composed of several layers consisting of keratin and lipids.Keratin is the primary substance that hardens nails and hair and protects the body from fluid loss and invasion by pathogens.

Identify the Primary Substance That Composes a Layer of the Epidermis,is