Answer:
A system of government in which the chief executive is constitutionally independent of the legislature (I guess)
The answer to this question is Bias
When researchers are being biased in their analysis, all of their analysis become really unreliable because it does not fully reflect to the truth.
To make the result of the researchers fully reliable, researchers need to base their analysis solely to the data at hand
I think you forgot the options, but i can give you some information that might be useful: the two are independent, but still, the federal courts can decide whether the state courts took their decisions according to the constitution.
The answer is the class system of stratification. To simplify, American Idol winner Carrie Underwood signifies the idea of a class system of stratification because as the daughter of a sawmill worker, she experienced intergenerational mobility. In addition, Intergenerational mobility refers to variations in social status among different generations contained by the same family. The class stratification is a custom of social stratification in which a civilization inclines to divide into distinct classes whose members have dissimilar admission to resources and power. An economic and cultural gap typically happens among dissimilar classes.