Suppose that the mean residence time of nitrogen in a section of soil is 3.5 years, and the mean rate of input is 150 kilograms per year. If rates of input and output as well as the total pool size have remained roughly constant, what is the expected size of the total pool of nitrogen in that soil?
A) 150 kg
B) 300 kg
C) 525 kg
D) 1,050 kg
Correct Answer:
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