Robert R. Jenkins PhDBackground It has been estimated that some 3 x 109 years ago, blue-green algae appeared and there went the environment, so to speak. Up to that time it is likely that oxygen existed only in oxides. We now live in an atmosphere consisting of a 21...
Background It has been estimated that some 3 x 109 years ago, blue-green algae appeared and there went the environment, so to speak. Up to that time it is likely that oxygen existed only in oxides. We now live in an atmosphere consisting of a 21...
