The independent variable is month of the year, the dependent variable is the concentration of the carbon dioxide in the atmosphere while the controlled variable is the date of each month on which the measurement is made.
If we wish to monitor the changes in the concentration of carbon dioxide then we must measure its concentration at regular, specified intervals.
The month of measurement is the independent variable while the concentration of carbon dioxide is the dependent variable.
The actual date in each month when measurement is made is a controlled variable.
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