Variables
An experiment has three main variables. The first is an independent variable, this is the only variable that is changed during a scientific experiment and is usually denoted with an "I." The next variable is the dependent variable, which is a variable that is dependent on the independent variable and is usually denoted with a "D." The last variable is the control, which is a group under normal conditions that is not experimental.
Boy Looking at Flower Through Magnifying Glass
What is the role of the dependent variable in an experiment?
to respond to the independent variable
to control the experiment
to change independently