When writing the conclusion of an essay comparing different genres, it would be advisable to end up it by stating a summary of the main points of comparison and contrast. The conclusion should start by giving a brief, general summary of the points which have been covered in the body paragraphs.
The appositive is usually a group of words related to a noun, usually a subject, and describes it in more detail.
The appositive here is a river that flows through Egypt.
Another way of easily spotting an appositive is by looking for commas - if it is separated from the rest of the sentence by commas, it is likely to be an appositive.
One word. If you do the process of elimination it can’t be the whole paper, two pages, or two paragraphs.