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B
Muscular diaphargm between thorax and abdomen
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C
Extra-abdominal testes to avoid high temperature of body
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D
Presence of external ears
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Solution
The correct option is B Muscular diaphargm between thorax and abdomen Whale, bat, and rat belongs to mammals and they possess many similar characteristics. Some of them are endothermic vertebrae, a four-chambered heart, the presence of a muscular diaphragm etc.