The intended audience is High school students. As the assigment explains, the presentation will be given to the speaker's classmates, that is high school students. In addition, although teachers will be present in the presentation, and will keep the results of the research, it is going to be shared with future students.
Remember that the intended audience is the group of people for whom you do something, in this case give a presentation.
Increases because it’s why heat exits.
The main idea of this paragraph is that the rocks cannot be explained by science, that there is a mystery to them. This sentence contributes to that idea because it gives a specific example of one of the odd things about the rocks. Because they are on a flat surface they should not roll or move on their own, but the fact that they have a trail behind them shows that they have somehow moved. This supporting statement is then supported by more details about the trails.
Arthritis Heart Disease Cancer Respiratory Diseases Alzheimer's Disease are the most <span>common health problems </span>