Originally Posted by Caveat Emperor
Why are we assuming this new form of life originated on this planet in the first place?
If every known life form on the planet follows a set pattern, and we find one that deviates at a very basic chemical level, shouldn't the possibility at least be considered that these microbes are extraterrestrial in origin?
So you're saying the aliens are already among us? Oh man it's like The Event!!!
But seriously I think that is a decent hypothesis.