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(D) Whales are classified as mammals because they exhibit key mammalian characteristics. The most definitive anatomical feature that distinguishes mam

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Diaphragm between the thorax and abdomen

Vedclass · Answer

(D) Whales are classified as mammals because they exhibit key mammalian characteristics. The most definitive anatomical feature that distinguishes mammals from other vertebrates is the presence of a $diaphragm$,a muscular partition that separates the thoracic cavity from the abdominal cavity. While whales also possess lungs,a four-chambered heart,and nostrils (blowholes),these features are also found in other non-mammalian groups (like birds or reptiles). The $diaphragm$ is a unique diagnostic trait exclusive to the class $Mammalia$.

Whales are classified as mammals because they possess a

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