Both of them change.
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A dependent variable is one that changes based on changes of the independent variable. Or we can say it depends on whatever happens to the independent variable.
An independent variable is the one that you change in the experiment. A dependent variable is the one that you measure, it changes depending on the independent variable.
The independent variable is the one that you change in an experiment. The dependent variable changes because of the independent variable. You control the independent and observe the dependent.
If changes in one variable do not affect the outcome of another variable, then the second variable is independent. A variable that is not independent is dependent.
An independent variable is a variable that isn't affected by something else. A dependent variable is a variable that's affected by changes in the independent variable.