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Photosynthesis and cellular respiration work together as a team in a never-ending cycle, together they recycle oxygen and other molecules allowing us to breathe. Both metabolic processes recycle oxygen in a very similar way. In Cellular Respiration we have the equation C6H12O6 + 6O2 à 6 CO2 + 6 H2O + Energy (Heat + ATP), showing that the exhaust is carbon dioxide and water, and that oxygen is the reactant. In Cellular respiration oxygen is used up to make carbon dioxide, oxygen undergoes several steps to be converted into carbon dioxide, which will later be used by photosynthesis. In the first step where oxygen is found is in the Electron Transport Chain (ETC). Here electron carriers that come from the Krebs cycle and glycolysis, usually NADH and FADH2, carry electrons down a cascade of electron acceptors that gradually take these electrons away. The carrier is pulled down the chain thanks to oxygen that is very electronegative and thus it demands more electrons then