In the section "Investigating Life: In (Extremely)Cold Blood",how does oxygen get into tissues of an ice fish?

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Oxygen in ice fish is transported by diffusion from their surroundings into their tissues. This is possible because of the high solubility of oxygen in cold water, which allows oxygen to diffuse more readily into the fish's circulatory system. Ice fish do not have hemoglobin to carry oxygen, so they rely solely on diffusion for oxygen transport.

In the Section "Investigating Life: in (Extremely)Cold Blood",how Does Oxygen