A regeneration experiment:

Planarians have extraordinary powers of regeneration and they normally reproduce by pulling in two. The fragments then regenerate their missing parts.

Research questions for you to explore:

Is there a size limit on the pieces of worm that will regeneration into a complete new individual? Is there a front/back dominance in regeneration ability? To find out, place a planarian on an ice cube to immobilize it. Using a razor blade or sharp scalpel, cut it in four equal parts. Keep the fragments in a petri dishes (or in plastic drink cups filled part way with pond or aquarium water) and observe for two weeks. Do your results suggest further questions you might tackle using these fascinating and easily handled flatworms.