Mammalian lungs have an enormous number of minute alveoli (air sacs). This is to allow

Mammalian lungs have enormous number of minute alveoli (air sacs). It is to allow

Lungs have a number of alveoli for

Lungs have a large number of alveoli for

Lungs have a large number of alveoli for

Lungs have a large number of alveoli for

Lungs have a large number of alveoli for

Division of mammalian lungs into a very large number of tiny alveoli around alveolar ducts opening into brondchioles, is