Edad de un río con el cauce más amplio y superficies planas de inundación

i only have few minutes according to the map above, which shows religious cultural regions, what two religions are most commonly practiced in africa? a. christianity and buddhism b. buddhism and hinduism c. islam and christianity d. hinduism and islam

i think the answer to your question is: settlement of the interior and economic growth. ( ^_^)／