Which of the following statements is NOT true with respect to dams and reservoirs?
A. stream discharge becomes fairly uniform, which harms aquatic ecosystems.
B. sediment is trapped behind dams and slowly fills in reservoirs.
C. dams are generally not effective at flood control and are mainly used to generate electricity.
D. reservoirs serve as an important source of fresh water.
E. water released from reservoirs is cooler than a natural stream, which harms aquatic ecosystems.
Answer: C
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