When a piece of zucchini is soaked in salt water the zucchini breaks down and loses its firmniss which best explains what happens to the zucchini

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.