Red-brown hair is abnormal, so natural red-brown hair lineage is family lineage. According to China Geographic Encyclopedia, there are a few people with red hair in Yunnan and Sichuan minority areas.
Hair refers to the hair that grows on the head. Hair is not an organ, so it does not contain nerves and blood vessels, but cells. Hair refers to the hair that grows on the head. Hair is not an organ, so it does not contain nerves and blood vessels, but cells. Hair is mainly used to protect the head. Soft and fluffy hair is elastic, which can resist light collision and help head sweat evaporate.