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Earth Sciences 15 Online
OpenStudy (tylermckinney16):

Which of the following statements is true about control variables? They are controlled in order to carry out a fair test. They can't be measured. In natural experiments, they can't always be controlled. They are the variables that are being tested.

OpenStudy (tylermckinney16):

A?

OpenStudy (adoni):

I believe that you are correct. (:

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