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The concentration of carbon dioxide in the atmosphere is A) a small fraction of 1%. B) approximately 10%. C) approximately 30%. D) approximately 50%. E) approximately 75%.

/in /by

The concentration of carbon dioxide in the atmosphere is
A) a small fraction of 1%.
B) approximately 10%.
C) approximately 30%.
D) approximately 50%.
E) approximately 75%.

 
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