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A scientific study looked at the effect of tanning beds on DNA damage.The scientists took skin cells and exposed them to UV radiation (the type used in indoor tanning beds)for different lengths of time: some for 1 minute,some for 5 minutes,some for 15 minutes,and some for 30 minutes.They then looked for signs of DNA damage and compared the results to cells that had never been exposed to UV light.
What is the independent variable in this experiment?

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The independent variable is the variable that is being manipulated by the scientist, which in this case is the length of time the cells are exposed to UV light. The other choices are either not being manipulated (untreated cells) or are constant throughout the experiment (number of skin cells, type of light, amount of DNA damage in the cells).

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