The answer is air pollution
Answer:
Check below, please.
Explanation:
5.
The scale of points produced by Gottman Group has shown two types of couple: High Risk and Low Risk of Divorce.
But the key factor was their interaction on the conversation.
This has shown us that Low risk of Divorce Couples score much more negative points than the High risk ones. And then the "low risk" got into a spiral of negativity so faster then the High risk.
6. The negativity threshold is how bad a Husband and Wife reacts to each other in theirs conversation. If there is a sequence of arguing, bad reactions then a negativity threshold is formed.
7. Similarly to a couple's relationship which is based on how a husband and wife reacts to each other while they're having a conversation, so the same as displayed in the equation

Is the way to countries at war behave.
8. To my surprise, I didn't know there was an equation by Mr. James Murray to explain a pattern of behavior of couples.
The answer is A. a single Slavic Group
The reason being is the most people in Europe speak Russian which falls into the Slavic category