Fast Evolution Affects Everyone, Everywhere. 1  Dec. 6, 2016 â Rapid evolution of other species happens all around us all the time -- and many of the most extreme examples are associated with human ...
Hair is simple in structure, but has important functions in social functioning. Hair is made of a tough protein called keratin. A hair follicle anchors each hair into the skin. The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft.
Protein. Hair and nails are made of modified versions of skin cells. These cells contain a protein called keratin. Keratin is a chain of amino acids that form the cytoskelet â¦ on (a form of mini-skeleton) of the cell, which thus forms the hair follicle or finger nail.