How did rivers influence ancient civilizations such as those in Egypt and Mesopotamia? A. They provided water for people and their livestock. B. They defend people against attacks by other groups.
C. They allowed people to be roam, rather than settling in one place.
D. They prevented people from farming crops.

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.

i think they came to washington to protest

the china one is last

explanation: