Discovery Science: Earth Biology – Animals – Worms
Earth Science: Biology – Animals – Worms Worms include members of several different phyla, including flatworms (Platyhelminthes), roundworms (Nemathelminthes), and segmented worms (Annelida). Most flatworms have a flat, sometimes paper-thin, body structure, filled with loose connective tissue. They lack advanced breathing organs and blood vessels and the digestive system ends blind without an anus. The … Read more