Earthworms are

Setae are present in all body segments of the earthworm except in the ..........

In $Pheretima$,the organisms obtain their nutrition from:

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:

If a living earthworm is pricked with a needle on its outer surface and the alimentary canal is damaged,the fluid that oozes out is .....

The septal nephridia of an earthworm discharge their excretory products into the.........