Final answer:
Act on sth (eg. feedback) means to take action or respond to something, such as feedback. In a system, when a change is made that influences the system, the system can act on the change by either counteracting it in negative feedback or amplifying it in positive feedback.
Step-by-step explanation:
Act on sth (eg. feedback) means to take action or respond to something, such as feedback.
For example, if a student receives feedback on their essay, they can act on the feedback by revising and improving their work based on the suggestions given.
Similarly, in a system, when a change is made that influences the system, the system can act on the change by either counteracting it in negative feedback or amplifying it in positive feedback.