Blank were highly prized and considered a symbol of wealth in the empire of great zimbabwe and in earlier bantu cultures.

Cattle

Explanation:

Cattle is the set of animals that were man-made to increase their production, agricultural services, domestic consumption, commercial or industrial. Cattle  was considered the main wealth and symbol of economic prosperity in the empire of Greater Zimbabwe and in previous Bantu cultures.

the only true answer is that it expanded after 325 ad.

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