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hydrogen
Oxygen
Carbon dioxide
Water vapour.
oxygen
hydrogen
hydrogen
hydrogen
Nearly 100% of air is gas. The rest is particulate matter: dust, pollen, and also tiny organisms.
Air is made up of 78% nitrogen, 20.95% oxygen, 0.93% argon plus traces of other gases.
80,000
Exhaled air will contain all of the gases in regular air, except that it will have higher percentages of carbon dioxide and lower percentages of oxygen. (It still will have oxygen, or CPR wouldn't work.) It will also have water vapor from our lungs. The main gas in inhaled and exhaled air is nitrogen. This is followed by oxygen, then carbon dioxide, then other gases. Yes, there is still more oxygen exhaled than carbon dioxide, but at a smaller percentage than was inhaled. Chances are that your teacher is looking for the gas, carbon dioxide, as your answer, since that is the product of cellular respiration that is disposed of in exhaled air, but it isn't the main component of exhaled air.
There is no gas by the name of "air" because air is really combination of several gasses.
Oxygen
FREON
Your question posted is not explained well. If you mean "Why does Nitrogen take up more percentage of air on Earth than all other gases" the answer simply is "it's the way god made the air" although Nitrogen and Oxygen percentages can drop a little if the air is more humid.
The solubility of each gas in water is different.