Why did the U. S. dispatch warships to the waters off Panama? O to prevent Panama from giving control of the Canal Zone to Britain
O to annex the land needed to build the Panama Canal
to ensure that Panamanian debts to American bankers were repaid
to aid a Panamanian rebellion against Colombia

"against" (and any subsequent words) was ignored because we limit queries to 32 words.

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.

answer; i believe the correct answer is (the willamete valley);