A) Homeothermy
B) Presence of diaphragm
C) Four chambered heart
D) Rib cage
Correct Answer: B
Solution :
The presence of diaphragm which separates the thoracic cavity from the abdominal cavity is the characteristic feature of all mammals. Homeothermy is the phenomenon by which the warm blooded animals, birds and mammals can maintain a constant body temperature. Four chambered heart is observed in birds and mammals. Rib cage occurs in all vertebrates. Hence, the correct option is (b)
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