Which of the following is a characteristic of $Amphibia$?

  • A
    Presence of scales
  • B
    Presence of air bladders
  • C
    Presence of poison glands
  • D
    Absence of scales,moist skin

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Describe the characteristics of the first tetrapods (Class Amphibia).

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Iodine deficiency in frog tadpole will lead to

Statement $X$: The skin of amphibians acts as a respiratory organ.
Statement $Y$: Amphibians lack an exoskeleton and have moist skin.

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

Frogs and toads are included in the order .......

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