Answer:
1. C & B I believe
2. ???
3. Fall of the Berlin Wall.
Explanation:
Hope this helps. :)
Physical environment will determine the limited amount of resources that we could obtain to sustain our life.
During the process of obtaining this resource, humans are forced to connect/interact with one another.
This could happen in the form of competition where we prevent one another to obtain it , or in the form of cooperation where we work alongside each other to share the resource.
