Which of the following phenomena is shown in the figure below? 
Definitions:
Dependent Variable
In an experiment, it is the variable being tested and measured, which is expected to change as a result of modifications to the independent variable.
Independent Variable
A variable in an experiment or study that is manipulated or changed to observe its effect on a dependent variable.
Independent Variable
A variable that is manipulated or changed in an experiment to see if it causes an effect on another variable.
Dependent Variable
The variable in a study or experiment that is observed for changes in response to alterations in the independent variable.
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