Alexander Fleming kept finding mold contamination that was killing his bacterial cultures.This observation eventually lead to the development of the antibiotic penicillin.Why would a fungus produce a compound that is selectively toxic to bacteria?

Question

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Fungi and bacteria often compete for resources in their natural environments. The production of compounds toxic to bacteria by fungi may provide a competitive advantage for the fungi by limiting the growth of bacterial competitors. This is known as allelopathy.

Alexander Fleming Kept Finding Mold Contamination That Was Killing His