What does this scene, which follows a significant fight and possible breakup, demonstrate about Knapp's Stage Model of Relational Development? Every couple goes through every stage of the model in order. Couples might go back and forth between different stages of the model over time. Once a couple begins to come apart, there is no way for them to repair the relationship and return to a satisfying relationship. Once a couple goes through all five of the stages of coming together, their relationship is guaranteed to work for life.

Couples might go back and forth between different stages of the model over time.

Explanation:

Nothing is a garantee that things are going to work for life. Knapp's Stage Model of a Relational Development explains certain stages, but they in each cases the stages would happend differently.

People can go apart and then go back in different stages and a relationship is built in time and it goes throught different processes.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).