4. How did Karl Marx's philosophy influence the 20th century?

5. In what ways is Nietzsche's idea of will different from Schopenhauer's?

Karl Marx’s theory was becoming increasingly more criticised in the 20th century with many sociologists that followed his beliefs, going against him. However it had more drastic impacts on the sociology of law, a study of the effect of economic forces and social changes upon the working of modern legal institution. The ideas were also more accepted as sociology was being seen more as a social science than a philosophy

And I haven’t studied the other question sorry.