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The survival of aquatic life in rivers becomes difficult mainly when their water pH is lowered due to

Question
The survival of aquatic life in rivers becomes difficult mainly when their water pH is lowered due to
Acid rain flowing into the rivers
Basic rain flowing into the rivers
Neutral rainwater
Evaporation of river water
Answer
Acid rain flowing into the rivers
Detailed Explanation
Acid rain flowing into rivers lowers the pH of the water, making survival difficult for aquatic life.
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