While Observing Goldfish, You Notice That Gill Flaps Move Up

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.

Correct Answer:

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