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Presence of large number of alveoli arou...

Presence of large number of alveoli around alveolar duncts opening into bronchioles in mommanlian lungs is

A

Inefficient system of ventilation with little of residual air

B

Inefficient system of ventialtion 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

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