I usually never refer to wiki.<quoted text>
When you got challenged you often came out with a mere copy and paste.
Show me where I have cut and pasted.
Regarding the universe being an open, closed or isolated system - I first said it was a closed system since I was thinking about the multiverse (or about higher dimensions that exceed the 4-dimensional universe excluding the claims of strings that posits 11 or so dimensions for our universe) with which exchanges of energy could take place and later clarified that by stating that our universe is isolated if the multiverse did not exist. Finally, I said it could not be deciphered experimentally if our universe was closed or isolated as these are only speculations.
Now, get down to solving those basic problems in math and physics and don't come out with incorrect answers like that grade 7 question on the chocolates which you got wrong.