Instrumental behavior can be reinforced in which two general ways?
a. positive reinforcement and negative reinforcement
b. reward and punishment
c. compulsion and reward
d. motivation and pain

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.