Aerobic Metabolism Arose in Response
Oxygen is potentially very dangerous to living things, because it reacts with organic molecules, and destroy these molecules
Oxygen can be poison to many anaerobic bacteria
The accumulation of oxygen in the atmosphere of early Earth probably exterminated many organisms and fostered the evolution of cellular mechanisms for detoxifying oxygen
Because of accumulation of oxygen in the atmosphere, this leaded to the coming of microbes which were able to use oxygen in metabolism