I meant that those are potentially breathable, thus reactive enough.
Though this is Auroras problem, actually, it should probably be Hydrogen. Isn't methane more or less the product of that?^^
The limits said are none because they don't change "how the world works".
Regarding complex Biology, we still have next to no idea how it is actually working, so coming up with strange kinds of aliens doesn't break any laws, and if it does, we can't possibly know it.
I sadly don't have a link to that experiment, I read it from a scientific paper I got by my chemistry teacher, and he didn't really dwell on it, it was more to support his view of life ("If you apply Voltage to a sausage, it smells like burning hair, now guess what's in the sausage") by ending it with the sentence "And then someone shut it down, and they were all gone")
Btw, this proof of concept did just proof that that kind of life could exist, it didn't result in actual Genetics being created. Like those experiments to produce aminoacids in what was believed to resemble the oceans a billion years ago, it was proof that life could develop in that soup, they didn't actually get any proteins.
The only reason from those experiments that we seem more likely is that we exist, over all, any kind of complex life at all, in any environment, is highly unlikely, yet it still exists.
Just as those life forms may all be unlikely, It is unlikely, nearing impossibility (of course never reaching it) that we would find an oxygen breathing race of roughly humanoid shape, that is intelligent, and has a desire to actually leave their planet.
Even if it exists, which is about as unlikely, actually finding it would pose an equally hard challenge.
Really? Then how come we don't see any smart plants? They seem to get by just fine by fast, massive reproduction for the most part.
Well, last time I checked, jellyfish did that aswell.
They don't even have a brain.
Btw, this comes up when you google "smart plants", and it's atleast going in that direction. Given an agressive Biosphere that provides enough energy by either photosynthesis or stealing it from other life forms, I think Intelligent plants would probably be a possibility. And possibly they would even breath Methane^^