The independent variable is the thing you are changing/varying.
The dependent variable is the thing you are measuring. This variable should be affected by the independent variable.
Control variables are anything that must be kept constant. If there are any other factors which affect the dependent variable, then these need to be controlled so that they do not have any significant effect (basically ensuring that you are actually measuring the effects of the independent variable).
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It is easier to control independent variables
They are respectively the ones you control (independent) and the ones you mesure (dependent).
control variables: the things that are not changing.Independent variables: the things that you change.Dependent variables: the things that are changed due to the independent variable
Free from outside control means Independent . While dependent Is opposite.
Every time the independent variables change, the dependent variables change.Dependent variables cannot change if the independent variables didn't change.