Environment is the place in which an organism lives, and the circumstances under which it lives.
Atmosphere contains 78% nitrogen, 21% oxygen, and 0.93% argon. The remaining 0.07% is made up of water vapor, carbon dioxide, ozone, and noble gases. Noble gases are extremely resistant to chemical bonding with other elements. Nitrogen also tends to be unreactive. But Nitrogen is very essential for life and for organic Nitrogen we are almost dependent on Nitrogen fixing bacteria.