The evolution of the earliest cells.
D000818:Animals; D005075:Biological Evolution; D002477:Cells / Q000378:metabolism / Q000648:ultrastructure; D004734:Energy Metabolism; D005227:Fatty Acids / Q000096:biosynthesis; D005580:Fossils; D010100:Oxygen; D010788:Photosynthesis; D013261:Sterols / Q000096:biosynthesis
D005227:Fatty Acids; D013261:Sterols; D010100:Oxygen