Which Statement About Gas Exchange in Fish Is True

Which statement about gas exchange in fish is true?

A) Blood flows over the gas exchange surfaces in a direction opposite to the flow of water.
B) Gases are exchanged across the gill arches.
C) Ventilation of the gills is tidal in fast-swimming fishes.
D) Less work is needed to ventilate gills in warm water than in cold water.
E) The path length for diffusion of respiratory gases is determined by the length of the gill filaments.

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