Answer:-
A controlled variable is a factor in an experiment that is kept constant to ensure that the results are only influenced by the independent variable. By controlling certain factors, researchers can isolate the effect of the variable they are testing. For example, in a plant growth experiment, the type of soil and the amount of water could be controlled variables, ensuring that only the amount of sunlight affects plant growth. Keeping controlled variables consistent helps improve the reliability and accuracy of the experiment, reducing the chance that outside factors influence the results.
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