The dependent variable.
Independent variable
Interestingly, it is often called the manipulated variable, though it is also called the independent variable and sometimes other names.
Control Variable
The dependent variable is the variable that can change in an experiment.
the independent variable
constant variable
A variable
A variable
A variable.
the dependent variable
Control Variable
If there is a factor that confuses the result of an experiment, I would call that a design flaw in the experiment. It might also be an uncontrolled variable.