Refer to the figure. 
According to the figure, how does the amount of nitrogen entering the atmosphere from human activities compare with the amount entering from land-based natural sources? (All values are in units of 1012 grams.)
A) Human: 81, natural: 158
B) Human: 81, natural: 268
C) Human: 100, natural: 128
D) Human: 130, natural: 128
E) Human: 130, natural: 228
Correct Answer:
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