what are the 3 different layers of skin ? - epidermis, dermis, subcutaneous gland, hair shaft layers - cuticle,cortex,medulla, natural colour pigments found in cortex - pheomelanin and eumelanin , where in the hair shaft does change accure? - cortex, growth patterns - double crown, nape whorl, cows lick, widows peak, what is the effects of arrector pill muscle? - cold, Goosebumps, traps warmth, hairs stand tall, where is a porosity check taken? - cuticle ,

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