The method of explaining by starting with a broad (big) idea and following it with specific (small) ideas in support of the main idea is sometimes called the deductive method
argue, claim, disagree, oppose, contradict, however, but, in contrast, otherwise, notwithstanding, in opposition, nevertheless, on the other hand/on the contrary, although, even though, while it may be true, still others may
The text presents a significant problem and explains it in detail, then a possible solution is suggested. Sometimes, only the problem is presented because there is no solution.
Cause and effect describes or discusses an event/action that is caused by another event/action. There may be a single cause and effect or several causes with several effects. Answers the question "Why did this happen?"
because, causes, creates, due to, for this reason, if this...then, leads to, on account of, produces, since, this as a result, consequently, hence, in effect, resulting, since, therefore, thus
Grammatical signals and expressions, general to particular, claim and counterclaim, cause and effect, problem and solution, identify the grammatical signal used in the text