The ? variable is the part of the experiment that is affected by the independent variable
To determine the answer to your question, you need to understand the concepts of independent and dependent variables.
In an experiment, the independent variable is the factor being manipulated or changed by the researcher. It is the variable that is intentionally controlled and set by the researcher. The dependent variable, on the other hand, is the variable being measured or observed in response to changes in the independent variable.
The ? variable you mentioned is the dependent variable. Its values or outcomes depend on the changes made to the independent variable.
To identify the dependent variable in an experiment, you should look for the specific outcome, response, or measurement that is being measured or observed throughout the study. This could be anything from a physical measurement (e.g., weight, height) to a behavioral response (e.g., reaction time, decision-making) or any other measurable or observable outcome that is relevant to the research question or hypothesis.