they have a common ancestor with other Europeans. They inherited some traits that evolved in their common ancestor. These traits evolved because they were adaptations to the cold climate of ice age Europe. These traits include a tall and narrow nose bridge, straight hair, lots of facial and body hair, short arms and legs, a rounded torso, thin lips, more fat under the skin than Africans, light skin tone, and relatively short stature. These traits mostly reduce body surface area to conserve body heat, or they insulate the body better to reduce heat loss. Light skin allow people who wear clothes to stay warm to absorb more UV light to make vitamin D. Vitamin D is important for strong bones. Vitamin D shortage can result in rickets, which in turn can cause deformed or broken bones and even death.