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In mammals, air enters lungs through tubes called , which branch into smaller tubules called , which extend out to tiny air sacs called .
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In mammals, air enters lungs through tubes called , which branch into smaller tubules called , which extend out to tiny air sacs called .

User Alexandru Chichinete
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Answer:

in mammals, air enters lungs through tubes called BRONCHI, which branch to smaller tubules called BRONCHIOLES, which extend out to tiny air sacs called ALVEOLI.

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User Seanalltogether
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