$Pheretima$ and its close relatives derive nourishment from

Which one of the following structures in Pheretima is correctly matched with its function?

Define the following terms:
$(i)$ Endomysium
$(ii)$ Prostomium

For earthworms,identify the $(i)$ Class,$(ii)$ Genus,$(iii)$ Order,and $(iv)$ Family.

Study the following in $Pheretima$.
$I.$ Dorso-intestinal blood vessels
$II.$ External intestinal plexus
$III.$ Internal intestinal plexus
$IV.$ Ventro-intestinal blood vessel
Arrange the blood vessels in the correct sequence of blood flow from the ventral blood vessel to the dorsal blood vessel.
The correct sequence is:

The nephridia,in earthworm,are analogous to