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What are alveoli? A. Carbon dioxide molecules B. Part of a red blood cell C. Tubes that connect to the lungs D. Air sacs used during respiration
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What are alveoli? A. Carbon dioxide molecules B. Part of a red blood cell C. Tubes that connect to the lungs D. Air sacs used during respiration

User Joao Luiz Cadore
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6 votes

Answer:

D

Step-by-step explanation:

Alveoli are tiny air sacs in your lungs that take up the oxygen you breathe in and keep your body going.

User Andy
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