Selenium in the environment.
D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D004032:Diet; D055593:Geological Phenomena; D005844:Geology; D006331:Heart Diseases / Q000517:prevention & control; D006801:Humans; D009369:Neoplasms / Q000517:prevention & control; D010944:Plants / Q000378:metabolism; D012643:Selenium / Q000378:metabolism / Q000502:physiology / Q000506:poisoning
D012643:Selenium