Introduction: Dugesia tigrina refers to the brown planaria typically found in small North American bodies of water (Saccomanno 1), which were used in this experiment. They belong to phylum Platyhelminthes, the flatworms (Myers 1). Their class is Turbellaria, consisting of free-living, marine and freshwater flatworms. They are both predators and scavengers (Miller and Harley 157). They have bilateral symmetry and are bottom dwellers who use cilia and muscles to move (159). They are triploblastic, having three germ layers, but are acoelomates, lacking a true body cavity (Myers 1). The primitive nervous system of planaria consists of a nerve net, lateral nerve cords, cerebral ganglia, eyespots, and auricles (Miller and Harley 160). The ganglia