Answer:
Investigating reasons your topic is important to you
Explanation:
It is a phrase that is commonly said and it doesn’t compare any two things, so it is an idiom.
The body of a research paper should include the main information that is backing up your argument, thesis statement, or subject of the paper. In the body of a research paper you will explain most of the relevant information about the subject making your case or highlighting important information for the reader on the subject matter.