There both gases
In the atmosphere, Nitrogen is about four times as common as is Oxygen.
it is oxygen
Carbon, Nitrogen, Oxygen, Hydrogen, and Calcium
100% Nitrogen, 321% oxygen, 1% Argon and Carbon Dioxide. The four most common gases in dry air consist of nitrogen, oxygen, argon, and carbon dioxide. Nitrogen and Oxygen make up most of dry air.
nitrogen and oxygen
In the atmosphere, Nitrogen is about four times as common as is Oxygen.
carbon, oxygen, hydrogen and nitrogen - have in common
Nitrogen and Oxygen are the most common gases in the atmosphere.
it is oxygen
Nitrogen & Oxygen.
Carbon, Hydrogen, Nitrogen, Oxygen
Carbon, Oxygen, Hydrogen, Nitrogen
nitrogen and oxygen
Nitrogen, oxygen, argon
nitrogen and oxygen
nitrogen
carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur = "CHONPS"