Question

scientific inquiry unit review
which variable changes based on what the experimenter does at the beginning of an experiment?
independent variable
dependent variable
controlled variable
following variable

Explanation:

The independent variable is the one intentionally manipulated or set by the experimenter at the start of an experiment. Dependent variables change in response to the independent variable, controlled variables are kept constant, and "following variable" is not a standard experimental variable term.

Answer:

independent variable