The gas that is responsible for breathing, combustion and oxidative processes is called?

It is without oxygen that the respiration of animals and plants, as well as combustion and oxidative processes of any chemical element, or compounds with it, would not be possible in our environment. Oxygen gas has a chemical formula, it is O2. Why is he so irreplaceable? Oxygen is one of the most active elements in non-metals. For example, it is during the interaction of oxygen with iron (Fe + O) that the process of corrosion and rust formation occurs.