3. Blue Eyes and Light Skin
Traits like blue eyes and light skin are more than just cosmetic—they are ongoing adaptations to specific environments. In northern latitudes, where sunlight is scarce, lighter skin aids in the production of vitamin D by allowing more UV light to penetrate the skin.
Similarly, blue eyes are believed to have originated and spread in populations living in these regions. The genes responsible for these features are still being selected for in certain parts of the world, showing evolution in action as humans continue adapting to their surroundings. Further reading