title: Geochemistry. Low oxygen stifled animals' emergence, study says.
authors.forename: Carolyn
authors.initials: C
authors.lastname: Gramling
mesh_terms: D000818:Animals; D001272:Atmosphere / Q000737:chemistry*; D005075:Biological Evolution; D010100:Oxygen / Q000032:analysis*
chemical_list: D010100:Oxygen