Which one of the following animals has a four-chambered heart?

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Which one of the following animals has a four-chambered heart?

King cobra
Turtle
Chameleon
Crocodile
This question was previously asked in
UPSC CAPF – 2022
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The correct answer is D) Crocodile.
Most reptiles (snakes like King cobra, turtles, lizards like Chameleon) have a three-chambered heart with two atria and a single ventricle, often partially divided. However, crocodiles are unique among living reptiles in possessing a complete four-chambered heart, similar to birds and mammals, which allows for complete separation of oxygenated and deoxygenated blood.
The four-chambered heart in crocodiles is an evolutionary adaptation that provides more efficient circulation, particularly beneficial for their active lifestyle and diving habits.

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