Between 1931 and 1940 a ton of soil blew out of the central and southern great. It was a period of severe dust storms that greatly damaged the ecology and agriculture during the 1930s.
B.
giraffes with short necks ate all the small trees. Giraffes with long necks were able to eat the short trees and the bigger trees. So when the smaller trees were finished the smaller giraffes died out and the taller giraffes passed the trait for having alonger necks along.
So B is your answer :)
B. when limited resources cannot meet unlimited wants
Hope this helps :)
Write the paper yourself. It is only 300 words.
here are some topics though: greenhouse gases (global warming), forest fires, WV cars putting more emissions that they claim they are in America WV vehicles, and for more just Google north America environment problems. then summarize the problem and write what you think about it. promise it will be done quickly. that isn't even a whole page single spaced typing.