title: Fitness in the universe: choices and necessities.
mesh_terms: D055580:Astronomical Phenomena; D001256:Astronomy; D005075:Biological Evolution; D002244:Carbon; D002338:Carotenoids; D002734:Chlorophyll; D003359:Cosmic Radiation; D004583:Electrons; D005118:Extraterrestrial Environment; D055593:Geological Phenomena; D005844:Geology; D006859:Hydrogen; D008027:Light; D008660:Metabolism; D009584:Nitrogen; D000069497:Origin of Life; D010100:Oxygen; D010788:Photosynthesis; D011522:Protons; D014785:Vision, Ocular
chemical_list: D011522:Protons; D002734:Chlorophyll; D002338:Carotenoids; D002244:Carbon; D006859:Hydrogen; D009584:Nitrogen; D010100:Oxygen