Distinguish between the following: Septal nephridium and pharyngeal nephridium.

In $Pheretima$,there are red-colored round bodies present above the alimentary canal in the $4^{th}$,$5^{th}$,and $6^{th}$ segments. It is believed that they are involved in:

In earthworms,in which segments are the blood glands located?

One of the traditional uses of earthworms is..........

In earthworms,setae are present in all segments,except the

Which structure is typically found in every body segment of an earthworm?