Suppose that the mean residence time of calcium in a section of soil is 6 years and the mean rate of input is 30 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 calcium in the soil?
A) 5 kg
B) 30 kg
C) 90 kg
D) 180 kg
Correct Answer:
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