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What is the most serious effect of water pollution created by human activity? A. It can affect the health of people or animals.
B. It can affect the air surrounding it.
C. It can interfere with future building in the area.
D. It can interfere with boating and cause accidents.
A. It can affect the health of people or animals.
Water pollution can lead to the contamination of drinking water and aquatic ecosystems, which poses serious health risks to both humans and wildlife. Pollutants can cause diseases, disrupt biological functions, and lead to long-term health issues. Therefore, the health impact makes it the most serious effect.