Zoology Question
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Which of these statements about the gas exchange system in fish is correct?
- It relies on a higher partial pressure of oxygen in water than in air.
- It enables oxygen to move from where its partial pressure is lower to where its partial pressure is higher.
- It relies on the parallel flow of blood and water in the gills.
- It enables oxygen to diffuse from the water into the blood over the entire length of the gill capillaries.