Answer:-
A controlled variable is something you keep the same throughout an experiment so it doesn’t affect the results. It’s important because it helps make sure that any changes you see are caused only by the factor you’re testing, which is called the independent variable. For example, if you’re studying how fertilizer affects plant growth, you’d keep things like water amount, sunlight, and soil type the same—these are controlled variables. Controlling these factors helps make your experiment fair and your results trustworthy because you’re isolating the effect of just one thing.
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