Question

Which characteristic feature out of the following differentiates birds from fishes, amphibians and reptiles?

• A. Terrestrial life
• B. Presence of vertebral column
• C. Presence of kidneys as excretory organs
• D. Four chambered heart

Answer 1

The correct option is D Four chambered heart

Four chambered heart is one of the most important feature of 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.