Respuesta :
The countercurrent exchange in the fish gill helps to maximize the diffusion.
What is diffusion?
It refers to the physical process at which the movement of the molecule movement should be done from the high concentration area to the low concentration area. here oxygen should be transported in the blood at the gills in the case when the oxygen level should be more than the water as compared to the blood.
Therefore, the diffusion should be considered.
learn more about diffusion here: https://brainly.com/question/18565254
