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________ are grape-like structure sat the end of the bronchioles. They have thin walls that are surrounded by blood vessels.

a. Bronchial tubes
b. Lungs
c. Alveoli
d. Windpipe​


Sagot :

Answer:

C. ALVEOLI

Explanation:

Alveoli (singular, alveolus) are grape-like clusters surrounded by networks of thin-walled pulmonary capillaries.