Microorganisms are not used in ____.

Biological warfare

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Curd formation

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Treatment of sewage

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Carbonation of drinks

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Solution

The correct option is D
Carbonation of drinks

Microorganisms are used for formation of curd from milk. They are also used in the treatment of sewage to decompose it into simple and unharmful compounds. They even can be used for biological warfare. Aerated drinks do not involve any use of microorganisms.

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