They have served their purpose and are no longer needed by the plant.
Both types of feedback require a signal to begin the process, transduce that signal, and exhibit a response
I would assume a major life change.
It can be negative things like loss of employment, divorce but it can also be positive things like a new job or moving to another country.
I hope this helps :)
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Can you add more detail to this question, I don't understand what you're asking. So sorry, I'll try to help as much as I can!
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