Which of the following animals has a single circuit of blood flow and two heart chambers?

Question

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Salmon have a single circuit of blood flow and two heart chambers, which means that their blood is pumped from the heart to the gills where it picks up oxygen and then goes to the rest of the body before returning to the heart. The other animals listed (squirrel, snake, and salamander) have either a double circuit of blood flow or more than two heart chambers.

Which of the Following Animals Has a Single Circuit of Blood