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  1. What is common in Whale, Bat and Rat?
    1. Absence of neck
    2. Muscular diaphragm between thorax and abdomen
    3. Extra-abdominal testes to avoid high temperature of body
    4. Presence of external ears
Correct Option: B

Diaphragm is present in mammals as a muscular seperator between thorax and abdominal region.



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