What is the difference between food chains and food webs?

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.

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure

Everything in the universe originated from a single point. how was it possible for everything in the universe to have occupied a single point in space?