The function of the keratin is to both a and b, and prevent the loss of water.
Keratin is a protein that is going to be a main molecule in the outer layers of the epidermis, in hair and nails. It is a molecule characterized by its hardness, which helps the skin to be firm and elastic. Its function is to give impermeability to the skin and protection so that pathogens and water from it are repelled.
Therefore, we can confirm that the function of the keratin is to both a and b, and prevent the loss of water.
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