The organization of blood and water flow in a fish's gills increases the fish's ability to

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The organization of blood and water flow in a fish's gills is specialized for the extraction of oxygen from the water. As water flows over the gill filaments, oxygen passes from the water into the bloodstream and carbon dioxide passes from the bloodstream into the water. This is known as counter-current exchange, which maximizes the diffusion of gases across the gill surface.

The Organization of Blood and Water Flow in a Fish's