Question

What is the importance of air?

Answer 1

I'd say for the supply of oxygen...

Explanation:

Air is made up of around `78%` of nitrogen gas `(N_2)`, `21%` of oxygen gas `(O_2)`, and `1%` of other gases, such as carbon dioxide, methane, noble gases, etc.

The most important gas for living organisms on Earth I'd say would be oxygen gas, due to it being essential for efficient energy production in the body, during aerobic respiration.

So, air is useful because it contains oxygen, which is what almost all, if not all organisms on Earth need to live and survive healthily.