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Variables
Independent variable is what you decide to change in the outcome and changes your dependent variable.
Dependent variable is the outcome of the experiment and what changes depending on your independent.
Your controlled variable is your original. It shows if something changes you can compare to what it is normally.
The control is very important to the experiment. It makes sure it valid, and makes everything more precise.
Do multiple trials in an experiment just in case, if you mess up or get the measurements, you wouldn't know if you only did one trial.