Natural Selection II

Natural Selection II
2006.12.16 3:44

Once I thought about why hair remains in three parts of our body. Head hair, hair under armpit, and puberty. In the first place, hair exists to protect something. Head hair is to protect from strong sunshine in a subtropical area, from extreme cold in cold area. Hair under armpit is to protect sweat in the area. Puberty hair is to protect from opposit sex's curious eyes.