What agency is not an example of expansion of the power of the federal ? government during world war 1
a. the railroad administration
b. the food administration
c. the american civil liberties union
d. the war industries board

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.

the correct answer is b.