I agree life could appear in many different places. If so, & with the revelation that life can survive space, Earth may be colonized by native species as well as alien species. There may have been interbreeding. Perhaps plants or animals, which are fundamentally different, are alien, while the other is native.
Life surviving the vacuum of space is a big thing!
23 posted on 06/24/2012 5:46:12 PM PDT by Mister Da
(The mark of a wise man is not what he knows, but what he knows he doesn't know!)
So is the order of things. Order and disorder exist simultaneously, which us why the Greeks started trying to puzzle out things and create what they called philosophy.
24 posted on 06/24/2012 6:54:55 PM PDT by RobbyS
(Christus rex.)