13. The exchange of CO2 and O2 occurs at _____ level. | Parhae.pk

13. The exchange of CO2 and O2 occurs at _____ level.

Leave a Comment / 10th Class Biology Chapter 1 BIOLOGY / By parhae.pk

(A)       Bronchiole
(B)       Tracheal
(C)       Bronchus
(D)       Alveolar

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