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Figure 54.9 -Which of the Following Is Not a Source of Human-Fixed

Question 21

Multiple Choice

Figure 54.9 Figure 54.9 -Which of the following is not a source of human-fixed nitrogen? A) industrially produced fertilizers B) cultivation of soybeans C) combustion of fossil fuels D) irrigation agriculture
-Which of the following is not a source of human-fixed nitrogen?


A) industrially produced fertilizers
B) cultivation of soybeans
C) combustion of fossil fuels
D) irrigation agriculture

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