Select all that apply. The earliest civilizations developed in the river valleys of: A. the Nile River B.the Yellow River C.the Amazon River D.the Tigris and Euphrates Rivers
The earliest civilizations developed in the river valleys of: "A. the Nile River" and "D. the Tigris and Euphrates Rivers" since these areas were the most fertile--meaning that crops were able to grow far more easily.
