The presence of an external ear (pinna) is a | vedclass

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(B) The presence of an external ear or pinna is a unique and defining characteristic of the class $Mammalia$. Birds do not have an external pinna; ins

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Mammals

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(B) The presence of an external ear or pinna is a unique and defining characteristic of the class $Mammalia$. Birds do not have an external pinna; instead,they have small openings covered by feathers. Reptiles also lack an external pinna and typically have a tympanum representing the ear. Therefore,the correct option is $B$.

The presence of an external ear (pinna) is a characteristic feature of which of the following?

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