What causes infectious diseases in the human population? (1) allergic reactions
(3) toxic chemicals
(2) poor dietary habits
(4) microorganism

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 happens when water’s salinity increases? mass decreases. freezing point decreases. buoyancy of objects decreases. the amount of dissolved minerals decreases.

Por qué crees que los huevos con cáscara se llaman amnióticos?