Hair & Scalp SciencesPregunta 62 de 100
The chief protein of which hair is composed is:
a.Collagen
b.Melanin
c.Sebum
d.Keratin
Explicación
Hair is made mostly of keratin, a fibrous protein also found in skin and nails. Keratin's cross-linked bonds give hair its strength and are the target of chemical texture services.
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