Question

In mammals, air enters lungs through tubes called _____, which branch into smaller tubules called _____, which extend out to tiny air sacs called _____.

Answer 1

In mammals, air enters through tubes called bronchi, which branch into smaller tubules called brochioles, which extend out to tiny air sacs called alveolar .

Answer 2

The answer is

A. trachea

B. bronchioles

C. spongy tissue