Controlled or the Independent.
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The independent variable is the variable that you change and manipulate in an equation. This causes the dependant variable to change.
The variable that changes due to a change in another variable is known as 'dependant variable".
It measures responsiveness of a dependent variable to change in an independent variable.
independent variable
If you change more that one variable in an experiment, then when the result occurs, you won't know which variable caused the change.