Answer:
Unrestricted sexual behavior.
Explanation:
The option that is NOT one of the key features of family life or universal functions of families, is <em>unrestricted sexual behavior</em>. Family is a fundamental social institution that has many functions. In families, there is economic cooperation. One of the most important functions of families is to reproduce and socialize children. But, unrestricted sexual behavior is not a key feature of family life. On the contrary, families regulate the sexual behavior of their members.
It depends on what you're referencing it to. the domino theory, in one historical aspect, was referenced during the Vietnam war. It was meant to say that if the US lost Vietnam to the communists, then countries like Cambodia, Burma, and eventually India would fall to the communists.
B.) The difference between the current value of a house and what the buyer paid for it.