The heart of a frog beats at the rate of:

What is the number of cranial nerves in a 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 $8^{th}$ vertebra of a frog is:

Identify the correct pathway of sperm transport in a frog.

The coloration in frogs and other amphibians is due to