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Class Mammalia

Which of the ...

Question

Which of the following pair have a four-chambered heart?

A

Aves - mammals

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B

Reptiles - Aves

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C

Reptiles - Pisces

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D

Pisces - Amphibians

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Solution

The correct option is A
Aves - mammals

Mammalian and avian hearts have four chambers comprising of two atria and two ventricles. This is the most efficient system, as deoxygenated and oxygenated bloods do not mix. Pisces have two-chambered heart. Reptiles have three chambered heart.

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