Which upper chamber of the heart contains oxygen-rich blood? a. the right atrium
b. the left atrium
c. the right ventricle
d. the left ventricle

What would be the most likely result if the ph of the stomach were increased to 5

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.

The finches on the galapagos island were similar in form except for variations of their beaks. darwin observed that these variations were useful for: attracting a mate defending territory building nests gathering food