They are bilaterally symmetrical, and vary in form. Annelids have more than two cell layers tissue, and organs located in its body. It has two openings in its body, a mouth, and an anus. Its nervous system possesses an anterior nerve ring, ganglia and a ventral nerve chord. It also has a closed circulatory system. Annelids also possesses no true respiratory organs. Annelids are true coelomates and possess true coelom in their body. They are also hermaphrodites. In the end, these creatures live in most environments, like your back yard.
Life function
These worms most of the time prefer to live in aquatic locations. There are over 9,000 species known. Annelids vary in sizes, from the giant earthworms al the way down to the bloodworm. They live quietly in holes or they live more active lives. Growth occurs more laterally than in width. The most common known Annelid is the earth worm, which eats, and re-enriches soil.
Ecological roles
Earthworms have an important ecological role as they eat decomposing organic material. As well as they are decomposers. Many other Annelids have important ecological roles from making nutrient rich soil, to decomposing composts.
Referances
http://www.earthlife.net/inverts/annelida.html
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