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B
Muscular diaphragm between thorax
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C
Testes, outside abdominal cavity
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D
External ear pinna
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Solution
The correct option is C Muscular diaphragm between thorax
The diaphragm is the only organ, which only and all mammals have and without which no mammals can live.
The diaphragm separates the thoracic cavity from the abdominal cavity and performs an important function in respiration. As a bat, whale and rat all are mammals, they all have a diaphragm. Hence, option B is correct.