Sunflowers seem to follow the path of the sun as it travels across the sky during the day. plants bending toward or following light is a response called

a) hydrotropism.
b) photosynthesis.
c) phototropism.
d) thigmotropism.

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.