Asocial scientist conducts research on two ethnic groups and comes to the conclusion that there are more similarities than differences between the two groups. when asked to present these findings to other scientists, they ask about the reasons and evidence used to reach that conclusion. to respond to this question, the social scientist will be primarily using which critical thinking skill

The answer is Explanation.

The social scientists were asked an explanatory situation in which they are required for reasons and evidence. In this case, these social scientists will use their critical thinking skill specifically explanation. 

Explaining their reasons, opinions, and evidence will give the audience the satisfactory they were looking for. Actually, explanation of things will more likely work out in their case if they were asked about their research.

The ceremonial column.