our skin and hair give up _______ on being rubbed
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Hair is a complex keratin fiber, which basically consists of three layers: the medulla, the cortex, and the cuticle. To understand the effect of hair care products, the surface charge of the hair has to be taken into closer consideration. Untreated human hair has a strongly negative surface charge.
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hope it help uhhh...
jasminekece:
wrong answer i think
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