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*'''Control Variable''': How much you watered them. They should both be watered the same amount to make it a [[Fair Test|fair test]].
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==Key Stage 3==
===Meaning===
A '''variable''' is anything which could affect the [[result]]s of an [[experiment]] or that you can change, keep the same, or [[measure]]/[[observe]] in an [[investigation]].
===About Variables===
: There are three types of variable.
*[[Independent Variable]]: The thing you choose to change in an [[investigation]].
*[[Control Variable]]s: The things you keep the same in an [[investigation]] to make it a [[Fair Test|fair test]].
*[[Dependent Variable]]: The thing you measure or observe in an [[investigation]].
: In an experiment or investigation there should only be 1 [[Independent Variable|independent variable]]. If you change more than one thing at a time, it is not a [[Fair Test|fair test]].