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(B) The presence of external ears,also known as $pinnae$,is a unique and defining characteristic of the class $Mammalia$.While some mammals (like whal

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Mammals

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(B) The presence of external ears,also known as $pinnae$,is a unique and defining characteristic of the class $Mammalia$.While some mammals (like whales) have modified ear structures,the presence of $pinnae$ is a diagnostic feature used to distinguish mammals from other vertebrate classes such as $Aves$ (birds) and $Reptilia$ (reptiles),which typically have ear openings covered by feathers or scales without external flaps.

External ears or pinnae are characteristic features of which group of animals?

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External ears (pinnae) are found in:

$S$ - Statement: The duck-billed platypus is a mammal.
$R$ - Reason: Mammals are viviparous.

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