Vitamin D, sunlight, and natural selection.
D005075:Biological Evolution; D044383:Black People; D002114:Calcinosis / Q000209:etiology; D002118:Calcium / Q000097:blood; D002245:Carbon Dioxide / Q000502:physiology; D005843:Geography; D006801:Humans; D011830:Radiation Effects; D012867:Skin / Q000378:metabolism* / Q000528:radiation effects; D013472:Sunlight; D014807:Vitamin D / Q000096:biosynthesis* / Q000633:toxicity; D044465:White People
D014807:Vitamin D; D002245:Carbon Dioxide; D002118:Calcium