What Happens During Countercurrent Exchange in Fishes

What happens during countercurrent exchange in fishes?

A) Oxygen enters the blood by active transport, and carbon dioxide exits the blood by diffusion.
B) Gas exchange occurs as blood and water move in the same direction across a respiratory surface.
C) Oxygen and carbon dioxide move in opposite directions across the respiratory surface by facilitated diffusion.
D) Oxygen enters the blood by diffusion, and carbon dioxide exits the blood by active transport.
E) Gas exchange occurs as blood and water move in opposite directions across a respiratory surface.

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