Killing bacteria from a living surface by using some chemical substance is called:

Explanation

Antisepsis refers to the process of killing or inhibiting the growth of microorganisms, particularly bacteria, on living surfaces such as the skin or mucous membranes. Antiseptics are chemical substances that are applied to living tissues to achieve this purpose. Examples of antiseptics include iodine, and alcohol. Antisepsis is commonly used in medical settings to prevent infections during surgical procedures or to clean wounds.