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 lungs through tubes called bronchi , which branch into smaller tubules called bronchioles , which extend out to tiny air sacs called alveoli.

Answer 2

In mammals, air enters lungs through tubes called _____, which branch into smaller tubules called _____, which extend out to tiny air sacs called _____.
trachea; bronchioles; spongy tissue
>> bronchi; bronchioles; alveoli
bronchi; alveoli; gills