The main difference between Gymnophiona $(Apoda)$ and Urodela is that Urodela:

  • A
    Have two auricles and one ventricle
  • B
    Have smooth,moist skin
  • C
    Have a cloaca
  • D
    Respire by lungs in the adult stage

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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.

The frog is called an amphibian because:

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

Give a scientific reason: Amphibia shows adaptation for terrestrial as well as aquatic life.

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