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What is common in whale, bat and rat ?
A. Absence of neck
B. Muscular diaphragm between thorax and abdomen
C. Extra-abdominal testes to avoid high temperature of body
D. Presence of external ears

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Correct Answer - B
The presence of diaphragm is a characteristic feature of mammals, diaphragm acts as a separater between thorax and abdomen. Whale, bat and rat all are mammals and have diaphragm.

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