An index fossil represents a species that lived during A. several intervals of Earth's history. B. a short interval of Earth's history. C. a long interval of Earth's history. D. Earth's entire history.

It would probably be B!

Explanation:

An index fossil is a fossil from a very short-lived, geographically widespread species known to exist during a specific interval of geologic time!

du boi was considered a radical because he wanted the immediate end for segregation. the biggest different between him and booker t. washington is that, even though washington believed that segregation should be considered illegal, he did not believe at all that a law was needed to keep blacks away from whites and that this would be something natural (to have the races apart) for a long time until society adjusted, while du boi believe that agitation was the only way to end segregation.

toi khong biet cau tra loi