Which of the Following Encourages the Movement of Water Over

Question

Which of the following encourages the movement of water over gills?
A) beating cilia
B) a fish swimming with its mouth closed
C) the diaphragm contracting
D) a muscular tail contracting

Accepted Answer

Beating cilia encourage the movement of water over gills in some aquatic organisms, facilitating gas exchange by moving water efficiently across the respiratory surfaces.