Identify the ethnic groups and languages spoken in china

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 court ruled that a state law that banned abortions (except to save the life of the mother) was unconstitutional

hope this : )