APES QOD February 2

Humans have dramatically altered the rate of nitrogen fixation into forms usable by autotrophs

A) because of the erosion of farmlands through poor agricultural practices
B) due to the burning of fossil fuels to meet our energy needs
C) as we produce synthetic fertilizers and apply them to crops, lawns, and parks
D) by using antibiotics to reduce the numbers of denitrifying bacteria
E) by selectively removing leguminous plants

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