Main excretory organs in a frog are

Which of the following functions is performed by the kidney in a frog?

In the kidney of a frog,........... pyramids are found.

Frogs respire in water by skin and buccal cavity and on land by skin,buccal cavity and lungs. Choose the correct answer from the following:

In male frogs,the ureter carries .......... .

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.