thelonelyscarecrow: castiels-time-traveler: nintendocanada: mapsontheweb: Map of the World by Natura
thelonelyscarecrow:castiels-time-traveler:nintendocanada:mapsontheweb:Map of the World by Natural Skin Colori’m really dumbfounded that i never realized skin colour is literally just caused by being closer to or farther from the equator and the resulting sun exposure and skin darkeningactually, its an adaptation. natural selection. people with darker skin are selected for in areas near the equator, where the melanin that causes the darker color protects them from radiation and protects them from skin cancer and other health defects, and because they are healthier they can pass on that trait more. people near the poles have lighter skin because it allows them absorb more of the limited sunlight to convert to vitamin d. THIS IS THE THING SOME PEOPLE HATE OTHER PEOPLE OVER.Evolution of melanin levels based on geographical location. -- source link