Why it is better to not use rhetorical questions in a research paper.

Rhetorical questions add a level of cheesiness to the paper and unless you are a very good writer, and I mean college professor level, then you will most likely fail at any attempt. Also writing research papers your suppose to be telling the reader what they don't know instead of asking them what is already do know. 

Should animals be killed for meat? should we stop deforestation to keep species of animals from going extinct? should we care if certain animals go extinct?

Because greyhound is a type of dog and shark is a type of fish