How did the ecosystem zones impact african culture and history

With the exception of South Africa and the countries of North Africa, all of which have diversified production systems, the economy of most of Africa can be characterized as underdeveloped. Africa as a whole has abundant natural resources, but much of its economy has remained predominantly agricultural, and subsistence farming still engages more than 60 percent of the population.

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ba geologist finds four sedimentary rock she determines that no geologic events have shifted the layers she labeles them a,b,c,dbfrom top to bottom