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1. |
Presence of large number of alveoli around alveolar ducts opening into bronchioles in mammalian lungs is: |
A. | Inefficient system of ventilation with little of residual air. |
B. | Inefficient system of ventilation with high percentage of residual air. |
C. | An efficient system of ventilation with no residual air. |
D. | An efficient system of ventilation with little residual air. |
Answer» E. | |