NEET BIOLOGY

Detailed explanation-1: -Earthworms, for example, have a complete digestive tract with two openings, as well as an esophagus and intestines. The circulatory system consists of paired hearts and blood vessels. Actually there are five pairs of hearts that pump blood along the two main vessels.

Detailed explanation-2: -An annelid, phylum name Annelida, also called segmented worm, is any member of a phylum of invertebrate animals characterized by the possession of a body cavity (or coe-lom), movable bristles (or setae), and a body divided into segments by transverse rings, or annulations, from which they take their name.

Detailed explanation-3: -The animals in the Annelida are segmented worms. They have no legs, and no hard skeleton. Unlike mollusks, annelid bodies are divided into many little segments, like rings joined together. There are many other kinds of worms, but only annelids are segmented this way.