Which problem is encountered by freshwater systems?
A) Eutrophication is a natural process that can occur only with the influence of humans.
B) Acid deposition represents a more serious hazard to lakes than rivers.
C) Rivers are more vulnerable than lakes to contamination by plant nutrients, oil, toxins, and pesticides.
D) Eutrophication has increased with the depleting ozone layer in the last 10 years.
Correct Answer:
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