The answer I chose is incorrect. please give me the correct answer. This is the

Question

The answer I chose is incorrect. please give me the correct answer.
This is the 2nd time I post the same question. I just need the right answer.

Incorrect Question 35 0 1 pts Within each lamella of the gill flaments, the blood flows in the opposite direction compared to the water in what is called countercurrent flow. This improves respiratory efficiency by increasing which of the variables in diffusion? the distance for diffusion (d) the surface area for diffusion (A) the concentration difference (Ap) the diffusion constant (D)

Explanation / Answer

Gills present in fish responsible for increasing the surface area for gas exchange actually gills remove oxygen present in water and the amount of oxygen is just 1/20 in water if we compare with the same volume of air. In the gills capillaries the flow of the water over gills in one direction while blood flows in the opposite direction and this called as countercurrent flow which is rsposible for maximizes oxygen transfer with in the gills.Thus in fish the gills are the efficient organ for respiration.

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