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Because it would take a long long time for oxygen and nutrients to get where they need to go in the cell. Being small allows the small molecules to move quickly where they need to go. Think of if you had to triple the size of your house and you had to use the bathroom. It would take you LONGER to get to the bathroom from the front door if your house was bigger. You would want the house to be smaller so you can get to the bathroom quicker (and not have an accident!).

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18y ago

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