What contributed the most to human migration more than ten thousand years ago?

sturdy boats were invented.
another ice age occurred.
a major volcano erupted in africa.
a severe drought occurred.

the best description of the camp david accords is that it was the first time an arab nation had officially recognized the nation of israel.

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.