Which of the following best explains how unions workers get better
wages?
a. the collective bargaining power of unions puts workers on a more
equal level with employers.
o
b. the high level of union dues pushes workers into demanding
better wages so they can afford their dues.
o
c. work slowdowns sponsored by unions employers cut
production costs and increase sales.
d. unions provide workers with the educational opportunities needed
to get the best-paying jobs.

Answer volcanic outgassing;

The first immigrants to settle in what is now the united states were the ancient ancestors of modern native americans. the precise routes of those first north american immigrants are disputed, but there is no uncertainty about the fact that every human being on the continent is either a recent immigrant or a descendant of earlier immigrants. since the first immigrants came here from asia more than thirteen thousand years ago, there have been four large and easily recognizable modern waves of immigrants into the united states.

It's either  a. chiang kai-shek and the nationalists turned against the communists and killed hundreds of them. orb. hundreds of peasants were killed in shanghai during the period of warlord rule.  if we take into account that there was warlord rule at the time, i think that it's b (not entirely sure though)just my best thoughts.