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Question

What is common in bat, whale and rat?

A
Absence of neck
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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.

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