Biology 4 kids
Biology4 Kids: Flatworms
Learn about some characteristics and environments of the super-primitive flatworm species.
CK-12 Foundation
Ck 12: Life Science: Roundworms
[Free Registration/Login may be required to access all resource tools.] The word "worm" is not very scientific. This informal term describes animals that have long bodies with no arms or legs. Worms with round, non-segmented bodies are...