(a) Pisces only
(b) Amphibians and reptiles
(c) Amphibians only
(d) Pisces and amphibians
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The correct answer is A. Pisces only.
Explanation: The heart does not circulate oxygenated blood throughout the body in Pisces. Because Pisces has a two-chambered heart, this is the case. Only de-oxygenated blood travels through it since the auricle and ventricle remain undivided. The ventricle then sends de-oxygenated blood to the gills, which oxygenates it. Among the vertebrates, Pisces (fish) have the most basic circulatory systems.