Earth's athmosphere

[CrusaderFrank]

Earth's atmosphere is 78% Nitrogen about 21%, and 1% Argon and the rest just stuff CO2, H2O, etc.

If plants breath in CO2 and exhale O2 why is there such an imbalance between the 2 molecules? Should Plants be suffocating? How can they be producing THAT much O2?

 

[Old Rocks]

Your questions are why they have textbooks and sciences sites on the net. I suggest you use them.