The best choice that describes something that is changed in an experiment is the independent variable. The independent variable is the factor that is manipulated or changed by the researcher to observe its effects on the dependent variable, which is the outcome measured in the experiment.
- Control variable refers to the factors that are kept constant to ensure that the experiment is fair.
- Dependent variable is the factor that is measured in the experiment and is expected to change in response to the independent variable.
So the correct answer is independent variable.
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