38. Fishes have a ________ chambered heart. A.Single B.Three C.Four D.Two
Answer: Option D Solution: Fish have a two-chambered heart with unidirectional circulation. Amphibians have a three-chambered heart, which has some mixing of the blood, and they have double circulation. Most non-avian reptiles have a three-chambered heart, but have little mixing of the blood; they have double circulation.
