A mixture of gases that strongly resembles the
major components of earth's atmosphere.
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It's the oxygen. Since oxygen doesn't dissolve into nitrogen - air is a mixture, not a solution - you can't call it the solute and the nitrogen the solvent, which may have been the answer you thought you were going to get.
proteins
Four fifths can be written as a fraction as 4/5. To convert this fraction to a percent, multiply it by 100. So, four fifths as a percent is 80%.
The ratio is approx 268 to 1000.
The two main atmospheric gases are nitrogen and oxygen. The approximate percentage for nitrogen is 78% and oxygen's approximate percentage is 21%.