All of the following were agricultural hearths, except __________.
b. sub-Saharan Africa
c. the Nile River Valley
All of the following were agricultural hearths, except (B) sub-Saharan Africa. Basically, sub-Saharan part of Africa geographically lies in the south of the Sahara desert. Agricultural resources and works are not merely applicable in deserts like Sahara. Vegetation there is very different.