What is the most important characteristic feature of birds when compared to fishes, amphibians and reptiles?

Four chambered heart

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Ability to fly

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Terrestrial life

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All of the above

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Solution

The correct option is A
Four chambered heart

Four-chambered heart is one of the most important features of the birds. Although it is seen in Crocodile, the four-chambered heart becomes a well-defined feature in birds for the first time during evolution. The four-chambered heart allows the organisms to keep the oxygenated and deoxygenated blood separate.

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