A) Homoiothermy
B) Internal fertilization
C) Presense of a 4-chambered heart
D) Presence of a muscular diaphragm
Correct Answer: D
Solution :
A complete muscular partition separates the thoracic cavity housing the heart and the lungs from the abdominal cavity containing all other viscera. This is called the diaphragm. It increases the efficiency of breathing.
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