7b. Carbon and oxygen atoms are responsible for most of the mass of a protein molecule. Where do these carbon and oxygen atoms come from?

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explanation:

okay now i don't know this but for the pints nothing else to say bye

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.