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chubhunter [2.5K]
3 years ago
5

____ are the small sacs that are the site of gas exchange in the lungs

Biology
1 answer:
sertanlavr [38]3 years ago
6 0

Answer:

alveoli

Explanation:

They are the smallest structures in our lungs where capillaries exchange O2 and CO2 in blood.

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