The contaminated water contains bacteria which uses oxygen and lowers the optimum level of oxygen necessary for survival.

True

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False

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Solution

The correct option is A
True

Chemical contamination of water act as nutrients for algae. This helps in the growth of algae. Once the algae dies, they serve as food for bacteria. A large quantity of oxygen gets used up in this process. Thus, this lowers the optimun level oxygen in water that is needed for survival.

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1 : 1

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