EVERYDAY SCIENCE

Detailed explanation-1: -The annelids is also known as the ringed worms or segmented worms, are a large phylum, with over 22, 000 extant species including ragworms, nereis, earthworms, and leeches.

Detailed explanation-2: -Leeches are segmented worms in the Subclass Hirudinea that are usually ectoparasitic. They belong to the Class Clitellata (along with earthworms, Subclass Oligochaeta) because of the presence of a clitellum, which is a swelling towards the head of the animal, where the gonads are located.

Detailed explanation-3: -There are many other kinds of worms, but only annelids are segmented this way. There are three main groups of annelids, the earthworms (and their relatives), the leeches, and a big group that lives in the ocean and are called polychaetes (pol-ee-keets).

Detailed explanation-4: -Leeches (often misspelled leach or leaches) are flattened segmented worms with a sucker on both tail and mouth. They move by attaching the mouth sucker, then tail sucker, then mouth sucker, and so on, flipping along the surface.