Antibiotics are chemicalsubstances that are derived from microbes like ______.
both A and B
Antibiotics or anti-bacterials are a type of anti-microbials used in the treatment and prevention of bacterial infection. They may either kill or inhibit the growth of bacteria. Several antibiotics are also effective against fungi and protozoans, and some are toxic to humans and animals, even when given in therapeutic dosage. Antibiotics are not effective against viruses such as the common cold or influenza, and may be harmful when taken in appropriately.