Which disease might be prevented by not sharing a water bottle?
a. mononucleosis
b. conjunctivitis
c. tooth decay
d. salmonella poisoning

answer; i believe the correct answer to the above question is ( friction)

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.