Scientists say that flatworms are the oldest living ancestors of those of us that have right and left sides - that means you!

[Free Registration/Login may be required to access all resource tools.] Discusses characteristics of flatworms.

Describes types of flatworms that are parasitic to humans and animals and what their life cycle looks like. Two or more hosts are needed for them to complete their life cycle.

Describes the basic characteristics of three of the major kinds of flatworms, including tapeworms, planarians, and flukes.

Describes flatworm characteristics, including their physical features, types, nervous system, respiration, digestive system, and reproductive system.