Your Thesis Paper should include your working hypothesis, and an outline of what you plan to do to prove or disprove your hypothesis. If you get outside help such as a mentor from a high school, college, or university, give them credit as your mentor. Be willing to discuss how they helped you. If they, however, produced most of the actual results of your project, the judges will know. Get guidance from experts if you need it, but do the work yourself.
Judges question science fair participants about their project.
If you have had too much help from other sources, it may become obvious when you can't answer technical questions about your research and experimentation. Remember that the judges that will be evaluating your project are experts in the particular field in which your project is classified. If there are to be no live animal displays, soil samples, biohazardous materials, glass containers, or bones or other animal products, don't choose a project that demands such items to be displayed for judging. Before your project is allowed into a Regional Science Fair, it has to pass inspection by people who know the rules. If your school allowed you to violate the rules for the school fair division, your project, nonetheless, will be stopped at the door of the Regional Fair if it made it that far.