Which of the three challenges of life is important for organisms to continue existing?
a. getting and using energy
b. reproduction
c. maintaining structure
d. maintaining water

Which sequence correctly shows the path of carbon dioxide during repiration?

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 is the period of cell life when it is conducting