In a well-designed experiment, there should be many __________________ that help researchers avoid confounding results. However, there should be only one _________________, the factor that is different among groups tested; if we have too many of these, we can't determine the real factor that impacted outcomes, which are called __________________. Question 16 options: dependent variables ... codependent variable ... control variables control variables ... independent variable ... dependent variables control variables ... dependent variable ... independent variables independent variables ... control variable ... codependent variables codependent variables ... independent variable ... control variables