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The bacterium Bacillus thuringiensis is widely used in contemporary biology as

1. insecticide
2. agent for production of dairy products
3. source of industrial enzyme
4. indicator of water pollution

Correct answer: insecticide

Solution

Bacillus thuringiensis (Bt) produces crystal proteins that are toxic to many insect larvae, so it is used as a biological insecticide. It is not primarily used for dairy production, industrial enzymes, or pollution indicators.

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