Trachea, bronchi, and bronchioles are all supported by _______
A. incomplete cartilaginous rings
B. complete cartilaginous rings
C. in-cartilaginous rings
D. bones
Answer:A
Trachea, bronchi, and bronchioles are all supported by _______
A. incomplete cartilaginous rings B. complete cartilaginous rings C. in-cartilaginous rings D. bones