There is so much value in a vivid illustration. I still remember how my high school biology textbook beginning a chapter on cellular respiration. If you wanted to get to the store, and you had a car with a full tank of gas, it said, you could drop a lit match into the gas tank. Perhaps some pieces of the car—and you!—might even make it to the store. But this is not the best way to use the energy at your disposal, and so it is worth exploring how energy is transformed, stored, and used.

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