Why do Black people have Nappy hair?
Nappy hair means extremely curly hair. Not all black people have nappy hair. Black people do not agree that all of them have their hair as nappy. The texture of the hair is evaluated by the angle of hair follicles and each of their circumferences. If the hair follicle is more angled, the hair is curlier. Nappy hair is believed to be possessed by African-American people. It is believed that nappy hair is mostly seen in the case of people descended from the Africans. They seem to have grown this type of hair to generate a defense mechanism naturally against the hot sun.
As the African countries are very hot, having long hair is not necessary for the people living there. If the hair is puffy in appearance and is occupying a large area, there is more chance for the hair to allow the passage of cool air. Due to the environmental adaptation, the development of nappy hair was inherited to the further generations. The dark skin and nappy hair protects the skin of the Africans from their hot climate than the light and straight hair. Though nappy hair is not on every African head, the dominant numbers of the people were having nappy hair as they were roaming in the environment where the growth of hair is ideal to be nappy.
When the Africans have to go in the sun and roam there for hours together to gather food and water, the scalp is protected by curly hair. Many years ago, people have migrated to various different places in the world. After moving to a new place they got accustomed to the environment. People who were in cold environments did not have vitamin D in their body. They also were living with reduced melanin. The hair of the white people also was lighter and thin. So, the growth of the hair is also not curly for the white people. Hence, the nappy hair is due to the very hot climate in West Africa.