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

  • A
    Amphibia
  • B
    Reptilia
  • C
    Aves
  • D
    Mammalia

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$S$ - Statement: $Capelle$ classified frogs and $Ichthyophis$ into $Amphibia$.
$R$ - Reason: Frogs and $Ichthyophis$ possess a three-chambered heart.

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Choose the correct sentence for $Amphibia$.

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