Natural evidence for chemical and early biological evolution.
D000596:Amino Acids; D055580:Astronomical Phenomena; D001256:Astronomy; D005075:Biological Evolution; D002247:Carbon Isotopes; D055598:Chemical Phenomena; D002621:Chemistry; D005118:Extraterrestrial Environment; D055593:Geological Phenomena; D005844:Geology; D000069497:Origin of Life; D010163:Paleontology
D000596:Amino Acids; D002247:Carbon Isotopes