How many vasa efferentia arise from the testes of a male frog?

Select the correct option regarding the respiratory system of a frog:
$(1)$ The glottis is covered by a thin,elastic cartilaginous flap called the epiglottis.
$(2)$ Frogs respire through gills or moist skin.

The epithelial lining of the respiratory system in a frog is derived from which germ layer?

Acoustic spots in a frog are present in:

In frogs, the number of pairs of cranial nerves arising from the brain are $ . . . . . . $.

Provide definitions/explanations for the following terms:
$(i)$ Tadpole
$(ii)$ Urinogenital duct