oxygen is most important use is for breathing
The most important is the oxygen.
The most important gas is oxygen.
The most important are oxygen and carbon dioxide.
oxygen
Respiration
If you didn't have oxygen, you would die!
Oxygen is the most important factor for living things.
Oxygen is more abundant than hydrogen. In fact it is the most abundant element on Earth.
carbon oxygen hydrogen nitrogen
The most important gas is oxygen
Oxygen is itself a chemical element.
The most important component of the air you breathe is oxygen. Oxygen is essential for the process of respiration, where it is used by your body to generate energy. Without oxygen, your cells would not be able to function properly.