Answer:-
A control variable is a factor in an experiment that is kept constant to ensure a fair test. It’s not the focus of the experiment, but controlling it helps isolate the effect of the independent variable—the one being changed—on the dependent variable—the one being measured. By holding control variables steady, researchers can be more confident that any changes in results are due to what they’re testing, not other factors. For example, if you’re testing how sunlight affects plant growth, you’d keep things like water and soil type the same. This helps ensure reliable, accurate, and valid experimental outcomes.
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