Question

which of these characteristics affects the diffusion oxygen into the icefishs blood?
icefish gills are white.
icefish have transparent, scale - less skin.
icefish hearts are colorless.
icefish have clear, thin blood.

Explanation:

Icefish have transparent, scale - less skin. This characteristic increases the surface area available for gas exchange (diffusion of oxygen). A larger surface area allows for more efficient diffusion of oxygen into the blood. The other characteristics (white gills, colorless hearts, clear thin blood) do not directly relate to the surface area or the mechanism of oxygen diffusion into the blood as significantly as the transparent, scale - less skin.

Answer:

Icefish have transparent, scale - less skin.