What is the circulatory system of Class chondrichthyes and Class osteichthyes?

Dear Student.
Please find below the solution to the asked query.

Closed circulatory system:- It comprised of circulatory fluid (blood) enclosed in blood vessels. Blood circulation is through pumping action of the heart pushing blood through closed vessels. Maintain high blood pressure. e.g. all vertebrates and a few invertebrates.
So in Class chondrichthyes and Class osteichthyes have closed circulatory system.

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