Why is the fish circulation classified as a simple and complete circulation?

Why is the fish circulation classified as a simple and complete circulation?
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Complete circulation is that in which there is no mixture of venous blood and arterial blood. Simple circulation is that in which the blood circulates only in one circuit (as opposed to the double circulation that have two circuits, the systemic circulation and the pulmonary circulation). In fishes the circulatory system is simple and complete.
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