LIFE SCIENCE

Detailed explanation-1: -Survival of the Fittest (Natural Selection) When bacteria are initially exposed to an antibiotic, those most susceptible to the antibiotic will die quickly, leaving any surviving bacteria to pass on their resistant features to succeeding generations.

Detailed explanation-2: -The spread of antibiotic resistance in pathogenic bacteria is a simple and elegant example of evolutionary adaptation by natural selection. Bacteria can become resistant to antibiotics through mutations that alter the cellular targets of antibiotics or by acquiring dedicated resistance genes from other bacteria.

Detailed explanation-3: -In the absence of selective forces of antibiotics, the bacterial lineage would evolve to lose genes that confer antibiotic resistance-anything that’s unnecessary. That’s stabilizing selection-the bacterial lineages should come back to the wild type through selective forces or be outcompeted."