Which of the following pair have a four-chambered heart

Aves - mammals

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Reptiles - Aves

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Reptiles - Pisces

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Pisces - Amphibians

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Solution

The correct option is A
Aves - mammals

Mammalian and avian hearts have four chambers two atria and two ventricles. This is the most efficient system, as deoxygenated and oxygenated bloods are not mixed. The right atrium receives deoxygenated blood from the body through both the inferior and superior vena cava.

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