One role of vitamin D is to help your skin gain strength. By this way you might hear the sun is a good source of vitamin D because its true and it helps your skin be healthier
For the first one the answer is Abduction and the second one is called Flexion. Hope I helped!
D it includes citations for all data
The liver functions as a filter for toxic substances in the body, that's why heavy drinkers usually have damaged livers.