3. Animals can develop illnesses from bacterial infections. Antibiotic medications are sometimes prescribed to treat these infections. What do you think might happen to a population of bacteria that is exposed frequently to such antibiotics?

it could mutate to where the antibiotic no longer works

Explanation:

its fairly simple if a medicine, antibiotic in this case  is not changed over time then the thing it is fighting will learn how to ignore it to where it no longer works as the species adapt and change the antibiotics must to otherwise there will be no effect.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.