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B
Viruses
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C
Insects
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D
Yeast
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Solution
The correct option is B Bacteria Antibiotics are the chemicals that kill or inhibit the growth of bacteria and are used to treat bacterial infections. They either prevent the bacterial cells from multiplying, so that the bacterial population remains the same, allowing the host's defense mechanism to fight the infection or kill the bacteria, e.g., stopping the mechanism responsible for building their cell walls.