Question: In counter - current flow: blood flows perpendicular to the water allowing a fish to extract close to 1 0 0 % of the oxygen

In counter-current flow:
blood flows perpendicular to the water allowing a fish to extract close to 100% of the oxygen out of the water:
blood flows perpendicular to the water allowing a fish to extract close to 50% of the oxygen out of the water.
blood flows in the opposite direction as the water allowing a fish to extract close to 50% of the oxygen out of the water.
blood flows in the same direction as the water allowing a fish to extract close to 100% of the oxygen out of the water.
blood flows in the opposite direction as the water allowing a fish to extract close to 100% of the oxygen out of the water.
In counter - current flow: blood flows

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