Alveoli are the terminal air sacs of the lungs, and are the sites of gas exchange between the lungs and blood. how does the surface area-to-volume ratio of the cells of alveolar walls relate to their function? hurry.

What are tissues? a groups of tissues that work together b basic units of structure and function c groups of cells that perform the same function d multiple organs that perform a major function

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.

What does natural resource management aim at ?