Nitrogen Enrichment of Ecosystems by Human Activity Is Largely Driven

question 23

Multiple Choice

Nitrogen enrichment of ecosystems by human activity is largely driven by

• A) addition of nitrogen fertilizers.
• B) nitrogen pollution from burning of fossil fuels.
• C) nitrogen fixation by bacteria in landfills.
• D) Both addition of nitrogen fertilizers and nitrogen pollution from burning of fossil fuels.
• E) Both addition of nitrogen fertilizers and nitrogen fixation by bacteria in landfills.

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