experimantal variable is ewan koh!
hahhahahaahah!
epal
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There are potential variables that are kept constant for each trial in a set of trials.
Your question isn't valid because you need an experimental procedure in place before you determine the variables.
A control sample is the experiment under regular conditions. An experimental sample is the experiment in which different variables are changed.
the experimental variable is like the independent variable, which is the only thing you can change in a science experiment, and the dependent variables are the things that stay the same.
These "variables" are called independent variables or constant variables meaning that they are capable of being changed by the experimenter but are intentionally held the same through each individual experiment.