Why are some illnesses like ebola or malaria considered epidemics in some locations and not a concern in others

In what for do plants utilize nitrogen? why do they need nitrogen?

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

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.