True or false? kübler-ross believed that the progression of grieving stages is nonlinear; one can oscillate back and forth between stages and even skip a stage.

That is "True".

According to kübler-ross there are five phases, denial, anger, bargaining, depression and acceptance, these are a piece of the system that makes up our figuring out how to live with the one we lost. They are instruments to enable us to outline and recognize what we might feel. In any case, they are not stops on some linear course of events in sadness.

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productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.