Question

Air in the Earth's atmosphere is a mixture of gasescomprising 78% nitrogen and 21% oxygen with traces ofwater vapour, carbon dioxide, argon, and various other
components. Which component of air cannot be used directly by the living beings?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d)Water vapour​

Answer 1

Answer:

Nitrogen cannot be used

Answer 2

The answer is nitrogen