what are the most important traits of the introduction and the conclusion paragraphs?

The most imporatant element of an intro is a good hook. Why? Because if you do not have a good hook no one wants to read it. I can tell you that I personally put down any literature if the intro sucks xP!
Most important part of a conclusion is re-stating what you said in your intro but in a different format and then answering and elaborating on whatever you said. Why? Well I think it is because you want to remind your reader why they are reading it and then giving them your opinions aboutthe subject.
 
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