What kind of evidence exists for the Bantu expansion? A. Agricultural evidence
OB. Religious evidence
C. Written evidence
O D. Linguistic evidence

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

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.