Correct option is A
The correct answer is: A) Four
Explanation:
Mammals have a four-chambered heart, consisting of two atria and two ventricles. This structure ensures complete separation of oxygenated and deoxygenated blood,
allowing an efficient double circulation system that supports their warm-blooded nature and high metabolic rate.
Information Booster:
- The right atrium and right ventricle pump deoxygenated blood to the lungs.
- The left atrium and left ventricle receive oxygenated blood and pump it to the body.
- Other warm-blooded animals like birds also have a four-chambered heart.
Additional Information:
- Three – Found in amphibians (e.g., frogs) and most reptiles, where oxygenated and deoxygenated blood mix.
- Two – Present in fish, where the heart pumps blood in a single circuit (gills → body → heart).
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