Which of the following are aquatic life zones in rivers and streams?
A. source zone, floodplain zone, vertical zone.
B. floodplain zone, transition zone, upwelling zone.
C. source zone, transition zone, floodplain zone.
D. upwelling zone, transition zone, floodplain zone.
E. transition zone, vertical zone, floodplain zone.
Answer: C
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