Increasing nitrogen fixation by humans has led to
A) increased greenhouse gas emissions.
B) increased species richness in grasslands.
C) decreased species richness in grasslands.
D) Both a and b
E) Both a and c

Question

Quizplus · Accepted Answer

Increasing nitrogen fixation by humans has led to increased use of nitrogen fertilizers, which emit greenhouse gases such as nitrous oxide. This results in increased greenhouse gas emissions, as in option A. Additionally, the increased availability of nitrogen can lead to the outcompeting of some native species by non-native species, resulting in decreased species richness in grasslands (option C). Therefore, both options A and C are correct, and the answer is E.

Increasing Nitrogen Fixation by Humans Has Led to