In addition the countercurrent flow of blood in the opposite direction of the water flowing across the gills, allows better equilibration between the fish blood and the water for oxygenation.
(the water; flowing; across the gills) (the countercurrent flow of blood in the opposite direction of the water; allows; better equilibration between the fish blood and the water for oxygenation)
the water the countercurrent flow of blood in the opposite direction of the water
flowing allows
across the gills
better equilibration between the fish blood and the water for oxygenation