Which one of the following animals has two separate circulatory...

In the aves and mammals, double blood circulation is found. Whale is a mammal.

DOUBLE CIRCULATION:
The movement of blood follows double circulation (systemic and pulmonary circulation) and circulation through special regions.
(i) Systemic Circulation: It involves the flow of oxygenated blood from the left ventricle to all parts of the body and deoxygenated blood from various body parts to the right atrium. It is also called systemic circulation.
(ii) Pulmonary Circulation: The flow of deoxygenated blood from the right ventricle to the lungs and the return of oxygenated blood from the lungs to the left atrium is called the pulmonary circulation.