Answer:-
A controlled variable is something that stays constant throughout an experiment. It’s not the focus of the study, but it needs to be kept the same so the results are reliable. For example, if you're testing how sunlight affects plant growth, the type of plant, amount of water, and soil should all be controlled. This way, you can be sure that any changes in growth are due to sunlight and not something else. Controlling variables helps isolate the effect of the independent variable, making your experiment fair and your conclusions more accurate. It's a key part of good scientific practice.
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