Define phylum annelida and list general characterstices?

Phylum Annelida is a group of segmented worms that includes earthworms, leeches, and marine worms.

General characteristics of phylum Annelida include:
1. Segmented body with repeated units called segments or metameres
2. Bilaterally symmetrical body plan
3. Coelomate body cavity filled with fluid
4. Well-developed circulatory system with closed blood vessels
5. Presence of a nervous system with a brain and nerve cord
6. Presence of a complete digestive system with a mouth and anus
7. External bristles called setae for movement and burrowing
8. Some species have specialized structures for respiration, such as gills or skin respiration
9. Reproduction can be sexual or asexual, with most species being hermaphroditic.