While observing goldfish, you notice that gill flaps move up and down in a constant rhythm. This movement
A)helps the fish take in small gulps of air and store them in lunglike sacs.
B)requires less energy than moving air over the gills.
C)is unnecessary when the fish are swimming constantly.
D)ensures that the gas exchange organs of the fish are surrounded by oxygen-rich water.

Question

Quizplus · Accepted Answer

The movement of the gill flaps helps to ensure that the gas exchange organs of the fish (the gills) are constantly surrounded by oxygen-rich water. This allows for efficient oxygen uptake and carbon dioxide removal from the fish's bloodstream.

While Observing Goldfish, You Notice That Gill Flaps Move Up