What is the relationship between the establishment of early civilizations in river valleys and societal development?

What is the main idea of the text: hammurabi's code

Which of the following statements about the migration of workers to other countries is false?

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.