A Recognize a problem C. Test the hypothesis with an experiment B Form a hypothesis D. Draw conclusions 1 Dana wanted to know how synthetic fibers were different from natural fibers. 2 Angela’s experiment proved that earthworms move away from light. 3 Scott said, “If acid rain affects plants in a particular lake, it might affect small animals such as crayfish, that live in the same water.” 4 Michael fed different diets to three groups of guinea pigs. His experiment showed that guinea pigs need vitamin C and protein in their diets. 5 Kim’s experiment showed that chicken egg shells were stronger when she gave the hen food to which extra calcium had been added.