Which of the following did not grow or increase as a result of early farming?

farming villages

human life spans

trade between cultures

cities

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 just did something on this guy a few days a go give me two minutes to find it in my notes.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain

the spanish  

hope this meaning spain btw