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|'''Controls'''
|-
|[[File:RaceChildren.png|center|200px300px]]
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*Everyone starts from the same starting line.
|}
{| class="wikitable"
|+This race would not be a [[Fair Test|fair test]] if variables were not controlled.
|'''Experiment: Does light affect cress growth?'''
|'''Controls'''
|-
|[[File:Cress.png|center|300px]]
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*Everyone starts from the same starting line.
*Everyone finishes at the same point.
*Everyone wears the same kind of shoes.
*Everyone has to run on the grass.
|}
If you want to know how plants grow differently depending on the light, you should make sure they are all watered the same, have the same soil and are kept at the same temperature.