Question

Nitrogen gas accounts for what percentage of the atmosphere? select one:

Answer 1

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 :) 

Answer 2

Nitrogen would be 78%. because there is not one gas in the atmosphere that covers the world and carbon dioxide would be about 1%