The advantage of the double loop circulatory pathway of some vertebrates over the single loop circulatory pathway of fish is that

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The double loop circulatory pathway allows for the blood to be put back under pressure after picking up oxygen in the respiratory organ, which is not possible in the single loop circulatory pathway of fish. This ensures that oxygenated blood is efficiently transported throughout the body, enabling increased metabolic activity and thus greater aerobic endurance.

The Advantage of the Double Loop Circulatory Pathway of Some