People living in the Sahel region in countries such as the Sudan, Chad, and neighboring Ethiopia suffer from undernourishment, desertification, and food security issues. Define these terms and describe how these factors intersect in the landscape of the Sahel.

Acivilization exists for several hundred yeaars, developing its own language. such a civilization probably has been: a. farming corn b. suffering from a lack of contact with the outside world. c. isolated by mountains or some other physical barriers. d. starving from lack of trade.