how do i write a introduction for a colon cancer paper for anatomy/physiology? can someone please help me?

i have to write a paper, i know how to do my body paragraphs but as for the introduction i am lost. i know in a persuasive paper you write your opinions pretty much, but what would you write for a research paper like this one? can someone please give me a sample of one, thanks so much.
no. i am not. lol.

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