In Recent Years, the Amount of Nitrogen Compounds Fixed by Human

question 10

Multiple Choice

In recent years, the amount of nitrogen compounds fixed by human activities has

• A)exceeded the amount of nitrogen compounds fixed by natural processes.
• B)been reduced to a level below the amounts fixed by natural processes.
• C)equaled the amount fixed by natural processes.
• D)fluctuated above and below the amounts fixed by natural processes.

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