Absence of thumb is characteristic of

Iodine deficiency in frog tadpole will lead to

Which one of the following is not a true amphibian animal?

$A$: $Ichthyophis$ is a poikilothermic animal.
$R$: Amphibians maintain their body temperature with the changing temperature of the environment.

Which of the following is not a true amphibian?

Describe the class Amphibia.