Answer :

kritter1
The answer is 78% because we know that there is a lot of nitrogen gas, but not 99%. It cannot be about 50% because that is too less. 0.03% is not a very likely answer. 

Hope I helped :) 
23briangiberson
nitrogen would be 78%. because there is not one gas in the atmosphere that covers the world and carbon dioxide would be about 1%

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