In which of the following vertebrate group/ groups, heart does not pump oxygenated blood to different parts of the body?(a) pisces and amphibians (b) amphibians and reptiles(c) amphibians only (d) pisces only

(d) Pisces only

Only in Pisces (fish), the heart doesn't pump oxygenated blood to different parts of the body, rather the oxygenated blood is supplied from the gills to the body by the dorsal aorta. Hence, in fish, the heart receives only deoxygenated blood.