Which of the following was part of the U. S preparations for war A. enacting the draft
B. maintaining neutrality
C. the Lend-lease act
D. the Normandy invasion

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 believe the answer is c

just finished this it is b. centrifugal force

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)