I am my opposite. I don't exist. What am I?

A commonly used tool for both survival and destruction, wind is one of my enemies, ...

I'm tall when I'm young and short when I'm old. What am I?

I can shed my former self, only to have my newer form shed again. I can be tricky, ...

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I lie in a red room with white curtains. Every now and then I peek out of my window ...

You eat my insides, then throw away my outsides. You eat my outsides, then throw away...

I am even. Give me two more and I become eleven. What am I?

I am freezing, but touch me and I'll burn you. What am I? [Two words]