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When birds inhale, air enters sacs around the lungs. When air is exhaled, it travels in tubes called alveoli through the lung. This shows how the _________ system of birds works.digestivenervousrespiratoryreproductivecirculatory

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The correct option is respiratory

The respiratory system is:

-the network of organs and tissues that help you breathe

-it includes your airways, lungs and blood vessels

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