7. in nebraska, where there are a lot of corn crops, which resource would be the most beneficial for that
area? why?

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong

answerclassical conditioning;

lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. so they expose rocks