How does an arrow crab use parasitism

the correct answer is b

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

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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.