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 show bilateral symmetry, meaning that the right side of their bodies is a mirror of the left. Learn more about flatworms in this learning module produced by CK-12.