Hi any s. e.x. y girl
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really you need to ask this

i think that d. wind is the answer.   i missed the question when i answered a. currents.

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.