The largest reservoir of nitrogen in the global nitrogen cycle is the atmosphere. Options A‐D below represent important pathways in the removal of nitrogen from the atmosphere at different rates.
A. Biological fixation in oceans
B. Fixation by lightning
C. Biological fixation in natural terrestrial systems
D. Industrial nitrogen fixation
Arrange the above pathways from the lowest to the highest rate.
1
D < B < A < C
2
B < D < C < A
3
B < C < D < A
4
A < B < D < C
5
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