A student built the following circuit from a diagram. What can the student do to make this a complete scientific investigation? A switch, two light bulbs and a battery are connected in a circuit. A wire from one side of the battery is going to one side of a light bulb. Another wire going from the other side of the light bulb is going to one side of the switch. The next wire is going from one side of the switch to one side of the second light bulb. The final wire is going from the other side of the second light bulb to the battery. The switch is down. The student can complete the same experiment outside. The student can try completing the experiment in the dark. The student can use completely new materials and do a different experiment. The student can change the size of the battery and see what happens.