10 Pillars of a Promising Project

6 of 10

6. Be Vigilant About the Variables

Variables help control the conditions so it's easier to collect results and draw conclusions. For your experiment, have one independent variable that affects the dependent variables. (For example, grow one type of plant in a pot that has earthworms and one type of plant in a pot that does not have earthworms. Make sure that both pots get the same amount of exposure to sunlight and water.)