Definition: Annelid, found in sea creatures such as snails and slugs, refers to a type of worm that feeds on organic matter. The term originally meant an underground animal that had burrow-like structures, like a gastropod shell, but it has evolved into a term for all forms of animals that feed on living things. Definition: Annelids are the primary class of worms invertebrates. They include slugs, snails, and crabs (including oysters and clams) as well as echinoderms like crabs or starfish. These creatures typically live underground, but they can also be found above ground. Some species have a hard outer covering to protect their internal organs, while others lack such protection. Annelids are known for their ability to digest organic matter without the need for digestive enzymes. This adaptation enables them to thrive in environments where other organisms would not survive.

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