Annelids are a diverse group of invertebrate animals that includes earthworms, leeches, and polychaetes.
They are characterized by having segmented bodies, giving them a worm-like appearance. They possess a complete digestive system and a closed circulatory system.
Annelids can be found in various environments, such as soil, freshwater, and the ocean. Some species are predators, while others are filter feeders or feed on decomposing organic matter. Additionally, many annelids have the ability to regenerate parts of their body if damaged.