Chromophil cells in earthworms are found in the........

In $Pheretima$,the coelomic fluid contains:

The clitellum of $Pheretima$ $posthuma$ is primarily associated with which of the following?

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:

Which of the following types of nephridia is not found in earthworms?

In Earthworm,the mouth is situated on