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The two straws represent the bronchi; the bottle represents the chest/chest cavity; the two small balloons represent the lungs; and the big balloon represents the diaphragm.

I'm not sure if my answer's correct since I'm not really certain that you used the same materials for our activity in Earth Science. Haha lmao (but if you used the same materials, then, "yeah it's correct", according to my teacher)
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