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Question

How does an aerobic bacteria contribute to contamination of water?
  1. It enables the aquatic life to survive.
  2. It releases a large number of harmful chemicals.
  3. It consumes all available oxygen in water.
  4. It decreases the water temperature.


Solution

The correct option is C It consumes all available oxygen in water.
A large supply of organic matter in water gives oxygen-consuming (aerobic) bacteria the opportunity to rapidly multiply. This will consume all available oxygen and kill all aquatic life because fish and plants require certain oxygen levels to survive.

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