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Why is the countercurrent system of flow important for fishes?

Sagot :

Question: Why is the countercurrent system of flow important for fishes?

Explanation and answer: Fishes use a design called 'countercurrent oxygen exchange' to maximize the amount of oxygen that their blood can pick up. They achieve this by maximizing the amount of time their blood is exposed to water that has a higher oxygen level, even as the blood takes on more oxygen.

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