A basic principle of style in academic and workplace writing is that the writer should make the text as easy to read as possible. Readers expect quick access to what the writer has to say. Never mind that the principle seems to be honored more in the breach than the observance; it still stands. An essential aspect of readability is coherence.
Coherence literally means "sticking together." The elements of coherent writing -- the words and the information they convey -- are related to one another so that readers can follow the flow of thought easily from sentence to sentence, paragraph to paragraph. The problem with the term coherence is that it sounds static, as if coherent writing just sits there sticking together. Coherence in writing actually has a dynamic quality, because it has to do with movement: movement of information and ideas, movement of the reader's changing perceptions and knowledge.
One of the most popular research paper topics for an abortion paper is the discussion on morality and ethics. The socially-constructed good and bad is one of the biggest questions that many try to tackle, and one that you, as a writer, should also avoid unless it's inevitable. This is highly based on the different culture and perspectives of people. Unless you want to seriously do some convincing of your own, you might have to keep your discussion on this topic at a minimum.