North american economies are based increasingly on
a.
heavy industry.
b.
fisheries.
c.
timber harvesting.
d.
high-tech industries.

Empty quarter and sandy desert

Yeah, i guess that checks out because the unused brain is almost like a clean slate or a new car. it has more value than an older already used brain. -thomasnash

Answer commensalism

Most of russia is located c) at high northern latitudes. that is one of the reasons both napoleon and hitler failed in their attempts to defeat russia--the extreme cold contributed to their defeat.