Who was at the top of Japanese society during its feudal period? Who held the real power?

In practice, the emperor became ruler in name only and the shogun, or members of powerful families ruling in the name of the shogun, held the real power through the military. 

whose power in the senate is equal to the power of the speaker of the house?

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.