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Almost 99% of earths atmosphere is made up of two gases. What are the two gases and the percents of each?

A) 21% oxygen and 78% nitrogen

B) 21% water vapor and 78% oxygen

C) 21% nitrogen and 78% oxygen

D) 21% carbon dioxide and 78% oxygen




Pls help me!!

Almost 99 of earths atmosphere is made up of two gases What are the two gases and the percents of each A 21 oxygen and 78 nitrogen B 21 water vapor and 78 oxyge class=

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The Answer Is A 21% oxygen and 78%nitrogen
The correct answer id A i just did the test

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