This experiment was conducted to determine the effects of environmental factors on the regeneration of planarian tail length. Regeneration is the process of regrowth and repair of body parts. This process can occur in many organisms, especially in planaria. The effect of light exposure (full light, shade, dark) on the regeneration of tail lengths of planaria, Dugesia tigrina, was used to test the hypothesis that planarian will regenerate more when placed in complete darkness. 12 planaria were used total in this experiment, 4 in each exposure of light. The planarian tails were originally cut off, and measurements of the length were collected every 2-3 days, over a two week period. During this time period the planaria were fed and the water was
