Compare and contrast economies of African kingdoms Ghana, Mali, and Songhai

Does anyone know the answers for these

This map shows the member states of the european union (eu). based on this map, what is the most likely reason the eu was formed? a) to increase trade between european nations b) to protect themselves from foreign enemies c) to begin the process of forming one large nation d) to isolate europe from the rest of the international community j

What is the main source of phosphorus?