All of the following were agricultural hearths, except
a. mesopotamia
b. sub-saharan africa
c. the nile river valley
d. mesoamerica

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.

2cool and cold temperature unless its an ever green tree