Humans Have Dramatically Altered the Rate of Nitrogen Fixation into Forms

question 29

Multiple Choice

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)by selectively removing leguminous plants
• C)by using antibiotics to reduce the numbers of denitrifying bacteria
• D)due to the burning of fossil fuels to meet our energy needs
• E)by producing synthetic fertilizers and applying them to crops, lawns, and parks

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