What was the primary reason that people first migrated into the tigris and euphrates valleys?

Which statement about sharecropping is correct?

The romans persecuted this group and even threw them to the lions in the coliseum what group was it ?

1. current events - by going to any of the major news sources on the internet, find out the issues that are being discussed in congress by searching under "politics." find a subject that interests you, tell what it is and explain what the issue is about.  detail what the arguments are on each side of the question. put the soures