In which animals does blood pass only once through the heart?
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Explanation:
Single circulation system as found in a typical fish species. The red represents oxygen-rich or oxygenated blood, the blue represents oxygen-deficient or deoxygenated blood. Double circulation pathways are found in birds and mammals. Animals with this type of circulatory system have a four-chambered heart.
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Explanation:
A typical two chambered hearth animals will have the blood flow only once through heart
Ex can be any typical fish excluding some exceptions
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