Can we give answer twice for one question?
Yes you can answer more than one time for any question. Sometimes we may learn more from others answers and we can update our response. And even reply to the answers.So to answer your question is yes you can reply more than once.
You should give different points in two answers same answers are not allowed.
Every answer can mean something different to the one reading it as long as it is re-worded.
You can put many answer for one question but if your answer is same like before it will be new problem.