Question

Which component of air can not be used directly by living beings?

Answer 1

nitrogen can be ur answer

Answer 2

The nitrogen and a rare amount of argon are present in the air which cannot be used by living beings.

Explanation:

The nitrogen is around 78.09% present in dry air. The oxygen is 20.95% and carbon dioxide is 0.04%. The living being requires oxygen content for existence rather than another component.

The life system completely depends on the oxygen present in the atmosphere. Oxygen is a must and important for the living system. Hence nitrogen content cannot be used as respiration.