Answer: Nicolaus Copernicus
Explanation: He was the first modern European scientist to propose that Earth and other planets revolve around the sun, or the Heliocentric Theory of the universe
1. One paragraph focuses on one subject and the next focuses on a different one that's related to the first one.
2. Sentences have structures like "____ is like this, while/but/however ____ is like that".
3. Sentences say something to the effect of "Both ____ are like this".
2 and 3 are also easy ways to identify compare and contrast essays if you simply apply this logic to the thesis statement in the introductory paragraph.