The
is responsible for the movement
of substances through the alimentary canal.

the speed increase from w to x due to increased gravity force

the speed decreases from x to y due to decrease in gravity

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.

the answer is c on e2020, bud.