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Time, which relies on nothing, is usually the independent variable of a lab.
don't ask me I have the same problem
The time is the dependent variable in the dominoes lab.
It's what you change to do your experiment. Say your doing an experiment like my friend Kristen Maxine Rogers is doing: Does air temperature affect how long soap bubbles last, her independent variable would be the different temperatures.
To limit diversity so you only have one variable.