title: Cutting anthropic knots and the rise of O2.
authors.forename: Norman H
authors.initials: NH
authors.lastname: Sleep
mesh_terms: D005075:Biological Evolution; D004247:DNA / Q000235:genetics; D018534:Earth, Planet; D018559:Exobiology / Q000639:trends; D005118:Extraterrestrial Environment; D006801:Humans; D019369:Life; D010100:Oxygen
chemical_list: D004247:DNA; D010100:Oxygen