A) homeothermy
B) presence of diaphragm
C) four chambered heart
D) rib cage
Correct Answer: B
Solution :
Homeothermy is found in birds also, similarly four chambered heart and rib cage is also characterised by other classes apart from mammals. But presence of diaphragm is a very unique feature of mammals which separates thoracic cavity from interior abdominal cavity.
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