6. What is the difference between constructive and non-constructive criticism?

Constructive criticism can help you improve on your work and is also known as feedback. Constructive criticism is offering valid and well reasoned opinions about the work of other. This can include positive and negative comments.
Non constructive criticism is not serving as a purpose of improvement. So the feedback they are giving does not serve as improvement ir advancement. It does not help at all. Non constructive criticism usually targets towards something or someone while constructive criticism targets to give feedback to help you while the other doesnt help u

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Perform surgeries is the correct answer.