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.
All About Amino Acids. Amino acids -- made up of carbon, hydrogen, oxygen and nitrogen -- serve as the foundation of protein. One type of protein, keratin, makes up about 88 percent of each strand of hair on your body.