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Answered

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When you pump a bicycle tire, what is happening to the particles inside the tire?

A:Nothing, because pumping in more air does not affect the particles inside.
B:They are moving closer together and contracting, filling the tire and making it more firm.
C:They are moving farther and farther apart, which is what expands the tire.
D:They are moving faster and faster, making the tire feel more full.