Many Plains nations depended upon which animal for their survival?

loess contribute to the flooding of rivers by providing the silt that is washed into rivers and constantly raises the bed of the rivers. this elevation above the surrounding flood plains and dams allow the river to overwhelm the dams and flood thousand of square miles of neighboring flood plains.

well considering i can't see the graph, it's probably prices

the octopus by frank norris

answer; philosophy;