What is the general effect of humans on the nitrogen (N) and phosphorus (P) cycles?

A. We greatly increase levels of N and P
through the burning of fossil fuels.
B. We cause levels of N and P in the
environment to drop through our farming
practices.
C. We overuse N and P in our farming
practices and cause high levels to enter the
natural environment.
D. We deplete levels of N and P in our
farming practices and do not replenish them.


C

Biology & Microbiology

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