Phylum Annelida –

 Aquatic or terrestrial.

– Free living or parasitic.

– Organ system level body bilateral symmetry and Triploblastic  coelomate.

– Metameric segmentation.
– Nephridia for excretion.

– Ventral double Nerve cord.

– Monoecious or Dioecious.

– Reproduction – Sexual.

– eg. Earthworm(Pheretima),Nereis etc.

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