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Give an account on phylum Annelida.
a. The organisms present in the phylum Annelida are .
b. These organisms are , , animals which have defined organ system.
c. Their body is divided externally into segments called , joined by ring like structures called .
d. Moist thin covers the body.
e. Locomotion in the organisms is through .
f. The organism can have separate sexes or may be united (hermaphrodites).
g. Examples of organisms present in the phylum Annelida include .
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