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    Biology
  3. Study Set
    Biological Science Study Set 3
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    Exam 53: Ecosystems and Global Ecology
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    Which of the Following Is Not a Source of Human-
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Which of the Following Is Not a Source of Human-

Question 19

Question 19

Multiple Choice

Which of the following is not a source of human- fixed nitrogen?


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

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