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fill up
5. a) downward (b) upward (c) downward
6.a) running (b) fast
7. (a) decreases
8.(a) alveoli
9.(a) more
10. (a) food (b) minerals (c) energy
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fill up
5. a) downward (b) upward (c) downward
6.a) running (b) fast
7. (a) decreases
8.(a) alveoli
9.(a) more
10. (a) food (b) minerals (c) energy
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