How is the number of individuals in a biological indicator species population related to the health of the water system?
A. If the number of individuals shows a steady decline, the health of the water system is also declining.
B. If the number of individuals shows a steady increase, the pollution in the water system is also increasing.
C. As the number of individuals increases, the population becomes a better biological indicator species.
D. As the number of individuals decreases, the population becomes a better biological indicator species.
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