Which motivation for exploring the Pacific Northwest did Spain, Russia, America, and Britain have in common? to establish a fur trade
to find gold and silver
to spread Christianity
to expand their influence

BEING TIMED HELP

I think its to expand their influence but I might be wrong

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 would think the answer is between b and d i would say d sorry if wrong