The correct answer of the given question above would be THROUGH CULTURE INFLUENCES AND TRADING. Egypt and Nubia strengthen each other at various times in their histories through culture influences and trading. Trading both helped Egypt and Nubia in maintaining their dominance in the Nile Region.
The third person is he/she/it/they.
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Stone points. they could be used in other weapons such as spears.
According to Chapter 2: Economic Systems,
Needs are met and wants cannot be met.