This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The main stem - trachea
the two branching stem- bronchi
the little stem - bronchioles
the grapes - alveoli or airsacs