Where possible a question needs an answer.
In casual writing you might be able to replace a question mark with a period, especially in dialog to indicate intonation, but usually the sentence structure of questions is different, so that a period will not be correct. For example, "Where did you go?" is correct as a question, but "Where did you go." is not correct.
Your question is incoherent.
A number is not a form of punctuation, it would become confusing to people to add numbers as punctuation. Therefore none of the numbers should replace the question mark
If you have to ask this question you should not be doing it.
ought is a "positive" word, so the question tag should be a "negative" you can replace "ought" with "should" so a possible question tag is shouldn't
what should replace the question mark and why?
In that sentence, you can replace the word structure with the word mass, so that the question reads:"All but two percent of Antarctica's land mass is covered by ice."
An emoticon that would best replace the question mark is :/ A punctuation that would best replace the question mark is '!'
It should be -2433.
I have Pokemon white, and my current moves are tackle, water gun, water sports and Tail whip. If so, which one should I replace it withy (THIS IS NOT AN ANSWER, THIS IS AN ADD-ON TO THE QUESTION)
This question asks what the importance of your job was. You should show your strengths as an asset to the company with your answer.
If you have to ask that question you probably should not attempt the job your self.