Answer the following:
What is the function of nephridia?
How many types of nephridia are found in earthworm based on their location?
Answer in one word or one line.
How many spermathecae are found in earthworm?
Draw a labelled diagram of the reproductive organs of an earthworm
Distinguish between the following: Septal nephridium and pharyngeal nephridium
Mention briefly about the circulatory system of earthworm