CK-12 Foundation
Ck 12: Life Science: Flatworms
[Free Registration/Login may be required to access all resource tools.] The word "worm" is not very scientific. But it is a word that informally describes animals (usually invertebrates) that have long bodies with no arms or legs. Worms...
BiologyWise
Biology Wise: Facts About Flatworms
Describes flatworm characteristics, including their physical features, types, nervous system, respiration, digestive system, and reproductive system.