Historically,N₂ Only Entered the Atmosphere as a Result of Nitrogen

question 38

Multiple Choice

Historically,N₂ only entered the atmosphere as a result of nitrogen fixation by bacteria and archaea.How has human technology affected nitrogen cycling?

• A) Humans genetically modified plants to allow them to fix nitrogen.
• B) Humans developed a method for artificially fixing nitrogen to generate fertilizers.
• C) Humans use nitrogen as a source of renewable energy.
• D) Human technology has had no effect on nitrogen cycling.