Why is it important for the cell to regenerate oxaloacetate? What would be the effect of an
oxaloacetate deficiency?

it is a

explanation:

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substitution is the answer in this case

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.