Antibiotic resistance
Antibiotics kill certain types of bacteria. Over time, those bacteria change to develop resistance to the antibiotics. Called antibiotic resistance, this is one of the most serious problems facing modern surgery and medicine. It is also one of the best examples of evolution in action.  According to The Lancet, at least 1.2 million people died because of drug-resistant bacterial infections in 2019, more than from HIV or malaria.