Both bacteria and viruses are often able to mutate quickly to adapt to environmental changes. Humans, however, do not show a high rate of mutation. Certain types of bacteria and viruses are disease agents in humans. Explain how the differences in rates of mutation between
humans and disease causing bacteria and viruses may hinder modern medical treatment of these disease.

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.