Will Antarctica change its shape if the ice melts and is it possible that Antarctica could be covered in vegetation one day, since plants and flowers are already starting to grow there?

Yes. The continent of Antarctica is covered by a giant ice block up to four kilometres thick. Most of the rock is below sea level, so if you took away all the ice, Antarctica would have a very different shape. Millions of years ago lots of plants and animals lived on Antarctica, and perhaps in the future they will again. But, it takes a long time to melt that much ice, so it's unlikely that any of us will ever see it.