1. Antibiotic is a chemical produced by a microorganism, which kills or prevents the growth of other microorganisms.

    Antibiotic is a chemical produced by a microorganism, which kills or prevents the growth of other microorganisms.

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  2. Antibiotic is a chemical produced by a microorganism, which kills or prevents the growth of other microorganisms.

    Antibiotic is a chemical produced by a microorganism, which kills or prevents the growth of other microorganisms.

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  3. By reducing the effect of the disease and by killing microbes.

    By reducing the effect of the disease and by killing microbes.

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