What is the difference between oxygen and air? In

What is the difference between oxygen and air?

Oxygen is only 20 per cent of the gases present in air, rest of the air consist of 79 per cent of nitrogen and 1 per cent of carbon dioxide, water vapour and other gases like argon and helium. But only the 20 per cent of oxygen in air is indispensable for human beings because it is very essential for breathing which keeps the human being alive.  

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