Which of the following classes of animals lac | vedclass

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(A) In the class $Amphibia$,the external ear is absent. Instead,a $tympanum$ represents the ear,which is a membrane that receives sound vibrations. In

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Amphibia

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(A) In the class $Amphibia$,the external ear is absent. Instead,a $tympanum$ represents the ear,which is a membrane that receives sound vibrations. In contrast,$Mammalia$ possess an external ear or $pinna$.

Which of the following classes of animals lacks an external ear (pinna)?

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