Identify the dependent variable on the Growth of Tortoise Shell graph

A variable is object that might be a trait, substance, factor or any which an experimenter manipulates or is the result of the change caused by the manipulation. There usually three kinds of variables in research, independent, dependent and the control.

The dependent variable cannot be determined in the given because there is no prior description but based on the title we can assume that it was the height of the subject being studied since "growth".