The tigris and euphrates rivers supported an ancient hearth of civilization, mesopotamia. explain why mesopotamia became a great place for a civilization to grow. what factors encouraged humans to settle and thrive in this part of the world

Which events occurred during the space race? check all that apply. (a) nasa was established. (b) yuri gagarin orbited earth. (c) the soviet union launched salyut. (d) the united states launched skylab. (e) the united states launched explorer 1.