Multiple choice

Which one of the following is not the cause of water pollution?

  1. Open defecation

  2. Chemicals and pesticides

  3. Animal waste

  4. Microbes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Microbes (bacteria and other microorganisms) are naturally present in water and soil, and are not causes of water pollution themselves - in fact, beneficial microbes help break down pollutants. Open defecation, chemical pesticides, and animal waste are all significant anthropogenic sources of water contamination.

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