1 Historical review: Some topics are better understood if a brief historical review of the topic is presented to lead into the discussion of the moment. Such topics might include "a biographical sketch of a war hero," "an upcoming execution of a convicted criminal," or "drugs and the younger generation." Obviously there are many, many more topics that could be introduced by reviewing the history of the topic before the writer gets down to the nitty gritty of his paper. It is important that the historical review be brief so that it does not take over the paper.
According to Emerson, there were three spiritual problems addressed about nature for humans to solve, "What is matter? Whence is it? And Whereto?". What is matter? Matter is a phenomenon, not a substance; rather, nature is something that is experienced by humans, and grows with humans' emotions. Whence is it and Whereto? Such questions can be answered with a single answer, nature’s spirit is expressed through humans, "Therefore, that spirit, that is, the Supreme Being, does not build up nature around us, but puts it forth through us", states Emerson. Emerson clearly depicts that everything must be spiritual and moral, in which there should be goodness between nature and humans. 
3. A , , or paper will create a "dialogue" between the essay author's ideas and her sources, and also among the sources themselves. and below evaluations will often summarize one point at a time, with the essay author's idea stated at the end. If you imagine a synthesis essay as a room in which the synthesis writer is joined by the authors of her/his sources, the , , or essay has everyone engaged in conversation or debate, with everyone commenting on (or arguing against) each other's ideas directly. In the and below essay, each person in the room stands up in turn, gives a speech, and sits down, with little or no question and answer period in between or afterward.