Answer:
The correct answer is nitrogen.
Explanation:
A layer of gases, generally known as air, which envelopes the planet Earth and is retained by the gravity of the Earth is called the atmosphere of the Earth. The dry air by volume comprises 78.09 % nitrogen, 0.93 % argon, 20.95 % oxygen, 0.04 % carbon dioxide, and smaller concentrations of other gases. Thus, when one is examining the quality of air in large cities, the element nitrogen should come about 80 percent in each of the samples of the air taken.
