Phylum Annelida

Phylum Annelida includes segmented worms like earthworms, leeches, and polychaetes. These worms have bodies divided into ring-like segments, which help in movement and flexibility. They have a true body cavity, a closed circulatory system, and nervous systems that run along their length. Annelids live in diverse environments, from soil and freshwater to marine habitats. Their segmented structure allows for efficient movement and regeneration of certain parts. They play vital roles in ecosystems, such as aerating soil, recycling nutrients, and controlling pests. Their complex anatomy reflects their adaptations to various ecological niches.