If an experiment fails to disprove a hypothesis, then __________. View Available Hint(s)for Part A it becomes a theory this lends support to the hypothesis but does not prove it is correct it is proven scientists will automatically believe itIn a controlled experiment, if a researcher wants to examine the effect of radon exposure to rat longevity, which one would be the independent variable? View Available Hint(s)for Part A the cage the rats were kept in radon exposure the rats' longevity neither the radon exposure nor the rats' longevity, because both variables are manipulated