In Pheretima, there are red-coloured round bodies in 4th, 5th and 6th segments above the alimentary canal. They are involved in
Excretion
Digestion
Reproduction
Leukocyte production
Circulatory System of Earthworm
Blood glands
In Earthworms, specialised kind of breathing devices are present and respiratory exchange of gases occurs through the moist body surface into the bloodstream.
-