ver

le ver (FR N-M) worm, a cold-blooded invertebrate animal. There are four main groups of worms: flatworms (Platyhelminthes), ribbon worms (Nemertea), roundworms (Nematoda), and segmented worms (Annelida). Fossil annelids have been found dating to at least 500 million, possibly even 1 billion years ago. The bodies of annelids are narrow, round, and segmented, with bristles (setae) or hairs; there are no bones. They may range from a few inches long to as long as twenty-two feet. Some have eyes or…