Why are asians black-haired?

The predominance of black hair among many Asian populations primarily results from genetics. The genetic variations that dictate hair color are influenced by evolutionary adaptations to environmental factors, such as climate and UV radiation exposure. Black hair is a dominant trait, which has been favored in many Asian regions due to its protective properties against sun damage and its association with healthy hair. Thus, the prevalence of black hair is a reflection of both genetic heritage and environmental adaptation.