The correct answer is (b) hippocampus, exocoetus, anabas.
Explanation:
Single circulation, where blood flows through the heart only once during a complete cycle, is a characteristic of fish. The other groups (amphibians, reptiles, birds, and mammals) have double circulation, where the blood passes through the heart twice in each cycle.
Why other options are incorrect:
(a) Labeo, Chameleon, Salamander:
Labeo is a type of fish, but the other two are reptiles and amphibians, which have double circulation, not single circulation.
(c) Hyla, Rana, Draco:
Hyla and Rana are amphibians, while Draco is a reptile. These groups have double circulation, not single.
(d) Whale, Dolphin, Turtle:
Whales and dolphins are mammals, while turtles are reptiles. Both groups have double circulation.