Which is a combination of two waves

the combinatio between P wave and S wave is called standing wave.It occurs when both waves has equal amplitude and wavelength.

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.

food source and hunting?