Which Is Incorrect About the Fish Heart

Which is incorrect about the fish heart?

A) Blood returns to the heart through veins.
B) The heartbeat sequence in the fish is maintained in vertebrates that evolved later.
C) It is a 3-chambered heart shaped like a tube.
D) The electrical impulse that produces the contraction is initiated in the sinus venosus.
E) It pumps fully oxygenated blood to the body that has passed over the gills.

Correct Answer:

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