Do you think that there will be a cure found for Co. vid-19 and our lives will be back to normal? ​

the answer is b.

hope this !

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.