Consider the following statements:I. Antibiot | vedclass

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(D) Statement $I$ is correct: Antibiotics are indeed chemical substances produced by certain microorganisms that inhibit or kill other disease-causing

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$I, II$ and $III$

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(D) Statement $I$ is correct: Antibiotics are indeed chemical substances produced by certain microorganisms that inhibit or kill other disease-causing microorganisms.Statement $II$ is correct: Alexander Fleming discovered the first antibiotic,penicillin,in $1928$ while working with the bacterium $Staphylococcus$ $aureus$.Statement $III$ is correct: Although Fleming discovered penicillin,its full potential as an effective antibiotic was established later by Ernst Chain and Howard Florey.Therefore,all three statements are correct.

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