The dots represent a bacterial infection. Sal was very sick with this bacterial infection. The infection was treated with antibiotics. Sal seemed to get well, but in a few weeks, she was sick again. How can this be explained using natural selection?

Question

abhisar · Answer

The first time when sal fell sick she was treated with antibiotics which lead to decrease in the serum level of the bacteria. This lead to sal's recovery. However at the same time some of the bacteria developed resistance against the antibiotic and survived. The multiplied and again manifested the disease