What is the best way to check the reliability and validity of a resource?

Analyze the author's education and professional background.

Explanation:

One of the easiest and most reliable ways to check the reliability and the validity of a resource is to analyze the author and his background. If an author is well-educated in the topic, he is more likely to express views that are well-respected in that community. Moreover, if the author is an expert in the area, it is likely that he will be able to better include sources and information that are relevant to the study of the subject.

east-west schism. the greatest effect of the east-west schism was the creation of two separate churches that had previously been unified under one church, the eastern orthodox church and the roman catholic church.

thurgood marshall

explanation: in 1954, thurgood marshall and a team of naacp attorneys won brown v. board of education of topeka, kansas. in this landmark decision, the supreme court held that segregation in public education violated the equal protection clause of the fourteenth amendment.