Controlled variables are the factors that are kept constant in an experiment to ensure that any changes in the dependent variable are due to the independent variable only. For instance, if testing sunlight's effect on plant growth, things like plant type and soil must remain unchanged. This ensures accurate and reliable results. ;
Controlled variables are the factors kept constant in an experiment to ensure accurate results. They allow researchers to isolate the effects of the independent variable on the dependent variable. Thus, the correct answer to the question is option C: Controlled variables.
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