In this class,the cloaca serves as a common opening for the digestive,urinary,and reproductive tracts.

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

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$A$: Dicondylic skull is found in amphibians and mammals.
$R$: The number of cranial nerves in amphibians and mammals is same.

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