A controlled variable means that it stays the same while other substances change. This helps prove the exact changes in an experiment.
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The controlled variable is the one that you chose to change while the dependant is the variable that changes because it is effected by the controlled variable
a control variable is a variable that needs to be controlled
The dependent variable does.
some characteristics of an independent variable are like the heading of a book
A variable is something that can stand as a subsitute for something. And a controlled variable is somthing controllable.