Explain how plants leaves, car radiators, and the alveoli found in human lungs all use the surface area to volume ratio to help them function.

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All three of these examples try to maximize the ratio of surface area to volume to try to facilitate some type of exchange. 

In the case of a leaf, it has a very small mass (and volume) but a large surface area to help maximize the amount sunlight that it can capture.  The more effectively the plant can capture sunlight with a relatively small number of leaves, the more food it...

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