To understand the answer, it’s worth taking a look at what hair is. Basically, it’s a protein filament, which is a long chain of proteins, that grows from hair follicles. You might remember from anatomy class in school that your skin has two main layers, an epidermis closer to the surface and a dermis underneath it. The epidermis has four or five sub-layers, depending on its location in the body, and the dermis has two sub-layers. Hair follicles are organs housed within the dermis...
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