Please explain ecosystem productivity

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 volcanoes form on a divergent plate margin

How does central place theory explain patterns in the size and distribution of cities?