What is common among whales,bats,and rats?

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(C) Whales,bats,and rats all belong to the class $Mammalia$. One of the defining characteristics of mammals is the presence of a muscular diaphragm th

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Muscular diaphragm between thorax and abdomen

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(C) Whales,bats,and rats all belong to the class $Mammalia$. One of the defining characteristics of mammals is the presence of a muscular diaphragm that separates the thoracic cavity from the abdominal cavity. While external ears (pinnae) are present in bats and rats,they are modified in whales. Testes are located outside the abdomen in many mammals,but this is not a universal feature across all species (e.g.,in some aquatic mammals). Therefore,the presence of a muscular diaphragm is a diagnostic feature common to all these mammals.

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