Oxygen is very rare in the fact that other planets do not have enough of it for us to breathe it naturally. Gravity is also a good factor to consider in the fact that it could crush anything.
To say we aren't special is foolish. The universe is so diverse and so different that there is not a planet exactly like ours. There may be other organisms as intelligent or more so but they will never require the same conditions or amounts thereof that we do.
English
-
Of course there isn't a planet [u]exactly[/u] like ours. But its inevitable that there is one similar.
-
Is it? I don't think so.
-
Why wouldn't it be? Our planet isn't a special size, no special/rare elements that are required for our life, proper distance from the sun isn't unique. Only thing we know about our own planet that we cant know for sure about most others is our magnetic field from our liquid core.