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One of the following is a very unique feature of the mammalian body:

1. Homeothermy
2. Presence of diaphragm
3. Four chambered heart
4. Rib cage

Correct answer: Presence of diaphragm

Solution

The diaphragm is a muscular partition unique to mammals that plays a key role in ventilation. The other options are not exclusive to mammals: homeothermy occurs in birds too, a four-chambered heart is also found in birds, and a rib cage is present in many vertebrates.

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