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18 votes
18 votes
Air sacs within the lungs

User Varundroid
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2 Answers

22 votes
22 votes
Air sacs within the lungs are the Alveoli! :)
User Jathanasiou
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2.3k points
16 votes
16 votes
Alveoli.I believe is the answer
User Jishnu
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2.3k points