Which of the following statements about lakes is true?
a. Stratified layers of lakes are characterized by vertical mixing.
b. Stratification increases levels of dissolved oxygen, especially in the bottom layer.
c. Lakes are more vulnerable than streams to contamination by plant nutrients, oil, pesticides, and toxic substances that can destroy bottom life.
d. Lakes have more flushing than streams.
e. Changing of water in lakes takes days to weeks.
Answer: C
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