Which is incorrect about the fish heart?
A. The electrical impulse that produces the contraction is initiated in the sinus venosus.
B. It is a three-chambered heart shaped like a tube.
C. It pumps fully oxygenated blood to the body that has passed over the gills.
D. The heartbeat sequence in the fish is maintained in vertebrates that evolved later.
E. Blood returns to the heart through veins.
Answer: B
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