KEY CONCEPT Flatworms, mollusks, and annelids belong to closely related phyla.
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KEY CONCEPT Flatworms, mollusks, and annelids belong to closely related phyla. reproductive system. eyespot. head. pharynx. mouth. sucker. gut cavity. Flatworms are simple bilateral animals. Flatworms have a solid body and incomplete or absent gut. - PowerPoint PPT Presentation