Question

In our atmosphere many gases are present but the Human only inhale oxygen why?? ​

Answer 1

Answer:

nice question bro

here is your answer

Basically when air fills our alveoli, by the process of diffusion, only oxygen in the air is taken into the blood stream while the other gases along with the waste CO2 is exhaled. So you do breathe in nitrogen, but it is exhaled as it is by the body.