Do black people do better in heat, and white people do better in the cold ?
Just saying humans do evolve, Africans come from a place that’s very hot, and Europeans, mainly northern ones and Anglo Saxons, come from a place that’s often very cold. So wouldn’t that affect genetics and susceptibility to the elements
- Anonymous1 month ago
Yes. Europeans evolved in the cold climate of the last ice age, after their ancestors migrated out of Africa 60,000 years ago. During an ice age, the tropics are still warm, but because of all the water tied up in ice sheets, there is drought, and drought is the reason why some Africans left Africa 60,000 years ago. Europeans evolved adaptations to reduce heat loss to the environment such as
1. reduction in skin surface areas such as thinner lips, rounded torso, shorter arms and legs, taller and narrower nose bridges and smaller nostrils, straight hair to eliminate the air space between hair and the top of the skill, and more body and facial hair
2. more fat under the skin for insulation
3. They also started wearing clothes to stay warm. Africans in general did not wear clothes before Europeans settled in the area. Because the clothes blocked out sunlight, they became more susceptible to vitamin D shortage, which can result in deformed or broken bones, even death. The light skin allowed them to absorb more sunlight to prevent rickets. These adaptations are also seen in many north Asians, such as the Ainu, the Japanese, Mongolians, Koreans, Eskimos, and the northern Chinese. These people faced a similarly cold climate and they evolved the same adaptations independently of Europeans. Scientists calle these independently evolved traits convergent similarities or convergences. An example of convergence is the whales, ichthyosaurs and fishes. Because they all live in the water, whales, ichthyosaurs and fishes all evolved to be similar in body shape, even though whales are mammals, and ichtyosaurs are reptiles
Because of these adaptations, a heat wave in Europe or India can kill lots of people but Africans are better equipped anatomically and physiologically to deal with hot climates so they are not as threatened by hot weather. They have longer arms and legs and a more slender torso to increase surface area to lose excess heat quickly. Their curly hair allow wind to quickly cool their heads. They also wear very little clothing. Africans who live in the USA in fact wear hoodies to prevent chills to their head.
- DixonLv 71 month ago
Yes. Skin colour is broadly a best compromise between blocking UV so as to
not get skin cancer versus getting enough UV on the skin to synthesise vitamin D.