While Observing Your Goldfish, You Notice That Its Gill Flaps

question 65

Multiple Choice

While observing your goldfish, you notice that its 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 lung-like sacs.
• B) requires less energy than moving air over the gills.
• C) is unnecessary when the fish is swimming constantly.
• D) ensures that the fish's gas exchange organs are surrounded by oxygen-rich water.

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