Building proteins and DNA is the reason organisms need wat substances

dude i stopped reading after the first 7 words but hey you seem real smart thats awesome have a great day

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.