The ratio is approxNitrogen : Oxygen : Argon : Carbon Dioxide :: 39000 : 10500 : 465 : 19.
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The respiration system adopts to the surface area to volume ratio to help the exchange of gases.
The earth's atmosphere comprises a volume of gases and that cannot be measured in square miles.
Circle graph
A mixture of gases that strongly resembles the major components of earth's atmosphere.
The two main atmospheric gases are nitrogen and oxygen. The approximate percentage for nitrogen is 78% and oxygen's approximate percentage is 21%.