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Antibiotics are now defined as:

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Substances produced wholly or partly by chemical synthesis, which in low concentrations inhibits the growth or destroys microorganisms by intervening in their metabolic processes.

Chemical substances not produced by microorganisms (bacteria, fungi and molds) that inhibit the growth or even destroy microorganisms.

Substance produced to kill bacteria

Purely synthetic compounds that inhibit the growth of microorganisms.

answer is C.

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