Why does " question mark " (?) even exist -,-

How do people behave when they are feuding and what characterizes their behavior

What kind of word is the pronoun in bold letters? the car will be yours when you pay your last car payment.

What is the main problem with the following critique? “you put some thought into it, but you obviously do not care much about the topic you are presenting.” a. it is not ethical. b. it is not constructive c. it is not specific. d. it is not behavior focused.