How did glasnost affect eastern europe? a. it increased the threat of nuclear war. b. it ended the salt treaty. c. it allowed countries to throw off communism. d. it established a communist presence.

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.

d) a constitutional amendment