The diagram given above shows part of the lining of the human trachea. What is the function of X?
A. Gaseous exchange
B. Mucus removal
C. Phagocytosis
D. Secretion of mucus
Answer:B
The diagram given above shows part of the lining of the human trachea. What is the function of X?
A. Gaseous exchange B. Mucus removal C. Phagocytosis D. Secretion of mucus