Humans have dramatically altered the rate of nitrogen fixation into forms usable by autotrophs by _____________.
A)selectively removing leguminous plants
B)using antibiotics to reduce the numbers of denitrifying bacteria
C)burning of fossil fuels to meet our energy needs
D)increasing the erosion of farmlands through poor agricultural practices
E)producing synthetic fertilizers and applying them to crops,lawns,and parks

Question

Quizplus · Accepted Answer

Synthetic fertilizers are the primary way humans have altered the rate of nitrogen fixation. These fertilizers contain nitrogen in the form of ammonium, nitrate, or urea, which can be readily taken up by plants. However, excessive use of synthetic fertilizers can lead to environmental problems such as eutrophication and acidification of soils and waterways.

Humans Have Dramatically Altered the Rate of Nitrogen Fixation into Forms