I believe the answer is: Experience.
As a couple gained more experience by staying in a relationship, they would most likely understand their partner enough to understand the things that could make each other angry.
So rather than acting on an impulse when they found their partner is in a bad mood, they could give them some space to vent.
The succed of ancient egyption civiliztion came partly from its able to conditions of nile valley for agriculture
If you still have the points you should be okay
the answer is false, because in modern society, people are able to move from one social class to another.
