Question: what is the primary evolutionary difference between mollusks and annelids?
Answer: Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. ... Different classes of mollusks have different ways of obtaining food. Annelids are segmented worms such as earthworms and leeches. Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system.