Answer:
introduction
As their name indicates,introduction should "introduce"outline,or give an overview of what you're paper is going to talk about this means introducing the topic, outline the major points that will be discussed,giving relevant background,and presenting a clear thesis(main idea).
Body
As the "meat" of the paper,the body is where the main idea are developed,soures are brought in to support them,each paragraph within the body should revolve around one major idea and follow the basic guidelines of a paragraph,i.e.,topic sentence,idea, support,wrap-up
Conclusion
conclusion wrap up or tie together everything that's been said and give you a final chance to lay out your main ideas before the reader
hope it helps
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