Which event did emerson call "the shot heard round the world"? a. the shots fired at the boston massacre b. the first shot fired at lexington c. the last shot fired at yorktown d. the first british cannon fire at bunker hill

B

Explanation:

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 discarded the supernatant and kept the pellet in this part of the experiment because you have to return all unused chemicals into their original containers at the end of each labratory.

explanation: