Which of the following is NOT a type of mollusk?

Earthworms are not a type of mollusk; they belong to a different phylum known as Annelida. Mollusks are characterized by having a soft body, often with a hard shell, and include creatures like snails, slugs, and octopuses, all of which fall under the phylum Mollusca. Snails and slugs are gastropods, while octopuses are cephalopods, showcasing the diversity within mollusks. Earthworms, on the other hand, do not possess these typical molluscan features, making them distinctly separate from the creatures classified within the mollusk category.