The Indian salamander is:

Which amphibian has no teeth in its jaws?

Which of the following is $NOT$ true for the $Axolotl$ larva?
$(I)$ It exhibits neoteny and paedogenesis.
$(II)$ The absence of thyroxine affects metamorphosis.
$(III)$ It is a hemichordate larva.

In which of the following organisms is the skin moist and acts as a respiratory organ?

Iodine deficiency in frog tadpole will lead to

Dicondyllic skull and $10$ pairs of cranial nerves are found in