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Question

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

A
Presence of diaphragm
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B
Four-chambered heart
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C
Rib cage
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D
Homeothermy
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Solution

The correct option is A Presence of diaphragm
A unique feature of the mammalian body is the presence of diaphragm.
Four-chambered heart is found in class Aves also.
Ribcage is also found in class Aves, Reptilia, Amphibia etc
Organisms belonging to the class Aves are also homeotherms.

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