Historical records from ice cores reveal fluctuating levels of carbon dioxide in the approximate range of _________.Today,atmospheric carbon dioxide levels approach _________.
A) 10-100 ppmv;200 ppmv
B) 100-200 ppmv;300 ppmv
C) 200-300 ppmv;400 ppmv
D) 200-300 ppmv;200 ppmv
E) 300-600 ppmv;600 ppmv
Correct Answer:
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