Why did w. e.b du bois oppose booker t. washington's views on racial discrimination?

Which of the following statements best describes the spread of communism in the years immediately following world war ii? a. the number of communist countries increased during these years. b. the number of communist countries decreased during these years. c. the number of communist countries stayed the same during these years. d. the number of communist countries increased in asia but decreased in europe. ( answer in the format above for me to understand)

American troops were worried about cantracting in cuba a. yellow fever b. hepatitis c. polio

Space is not completely empty. there are small particles in space. what happens when these particles come together?