Respiratory frequency is the number of respiratory movements per minute. place one hand on your chest estimate the respiratory frequency at rest.

the answers are a and c

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.

acceleration = 18/3 = 6 m/s per second.

hope i

-lavira: )