Which amphibian has no teeth in its jaws?

Columella auris is found in

$Assertion (S)$: In amphibians,the skin is thin,moist,and highly vascularized.
$Reason (R)$: Amphibians perform cutaneous respiration through their skin.

Limbless amphibians belong to the order:

An animal having pentadactyl limbs without claws belongs to the class

Which of the following organisms exhibit indirect development?