A variable that exerts influence on the dependent variable but is not an independent variable is a(n): Co-dependent variable. Non-extraneous variable. Extraneous variable. Complex variable.

Extraneous variable.                                                        

Explanation:

Extraneous variable: In psychological research, the term "extraneous variable" is determined as variables that an experimenter or investigator isn't studying intentionally while conducting research or a study. An investigator or an experimenter while conducting any research or study looks for selected variables that are one variable i.e, independent variable that possesses an effect on some other variable i.e, dependent variable and therefore one variable which is considered as unwanted is mainly extraneous.

The extraneous variable generally affects the dependent variable apart from the independent variable.

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