Si me preocupan Los problemas ambientales
The correct answer is comma.
Other punctuation marks are used for other reasons such as ending a sentence or instead of a missing letter and in contractions. Commas are used in front of conjunctions such as the oxford comma used before and.
The purpose is to entertain, yes it does have factual information but it mostly has a humorous tone!
I believe it is called an "n" dash. It looks like this "-".
Ex: Twenty-one, Eighty-nine, Ninety-seven <span />
