EVERYDAY SCIENCE

Detailed explanation-1: -rag worm, also called clam worm (genus Nereis), any of a group of mostly marine or shore worms of the class Polychaeta (phylum Annelida).

Detailed explanation-2: -They comprise the dominant invertebrates of the deep sea. Fresh or inland water annelids can be found in all kinds of aquatic and semi-aquatic environments, such as lakes, ponds, streams, rivers, groundwater, wet soils, and other wet habitats.

Detailed explanation-3: -Annelids crawl or burrow by combining the actions of these muscles and the bristles, or setae, on the outside of the body. The organism first extends forward and then anchors the front end of the body to a solid surface using the bristles.

Detailed explanation-4: -The annelids /ˈænəlɪdz/ (Annelida /əˈnɛlɪdə/, from Latin anellus, “little ring"), also known as the segmented worms, are a large phylum, with over 22, 000 extant species including ragworms, earthworms, and leeches.