Unique feature of mammalian body is the presence of:

Four chambered heart

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Presence of diaphragm

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Warm-blooded

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Rib cage

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Solution

The correct option is C Presence of diaphragm
The presence of a diaphragm is a peculiar feature of the mammalian group.
Four-chambered hearts can be found in birds too.
Mammals and birds are warm-blooded animals due to their ability to maintain their body temperature.
Rib cages are found in a lot of animals other than mammals like birds, reptiles, etc.
So the correct answer is 'Presence of Diaphragm'.

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