Question

Complete the statement below.

The respiratory system is divided into...
A. the major and minor respiratory systems.
B. the right and left respiratory systems.
C. the relevant and irrelevant respiratory systems.
D. the upper and lower respiratory systems.

Answer 1

D. the Upper and Lower Respiratory Systems

Step-by-step explanation:

Upper is the nose, sinuses, etc.

Lower is the lungs, bronchial, etc.