The residence time of an ion in the oceans may be determined by ________.
A. multiplying the input rate by the output rate
B. multiplying the ionic concentration by the total amount of the ion
C. multiplying the total amount of the ion by either the input or output rate
D. dividing the total amount of the ion by either the input or output rate
E. dividing the ionic concentration by the input or output rate
Answer: D
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