What is the main function of compound epithelium?

Which of these structures is dorsal in male cockroach?

How many types of nephridia are present in the earthworm?

The teeth of the gizzard in cockroach is composed of __

Microvilli is present in the epithelium of ___

Frogs have compound eyes. True or false?

Which of the following is not a part of the excretory system of frogs?

What are the pores present on the surface of the body of the earthworm called?