Respuesta :
Positive effects of flooding by the Tigris and Euphrates rivers were that they allowed irrigation every year.
Negative effects of flooding by the Tigris and Euphrates rivers were that the floods were unpredictable and would cause the irrigation paths to be remade.
Negative effects of flooding by the Tigris and Euphrates rivers were that the floods were unpredictable and would cause the irrigation paths to be remade.