They're the parameters that vary. Hence the name.
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time or length could be two different variables depending in what the investigation was based on
It is easier to control independent variables
A testable variable is what you test several times for a scientific investigation or medical investigation.
The answer depends on the nature of the investigation.The answer depends on the nature of the investigation.The answer depends on the nature of the investigation.The answer depends on the nature of the investigation.
If none of the variables are constant (or controls) you have no idea which variable or combination of variables caused the effect.