I think that the concept is still way too early to make any judgements about its likelhood or even possibility.
BUT...
if you look at the universe you do see sign after sign of replication. We see stars that are similar, galaxies that are similar, movement that is similar and an underlying basic set of rules that seem to define motion and form.
Given that, I would not be surprised to see things replicated at lesser levels as well. That does not imply that life, as we see it would be the same, I would expect to see similar diversity no matter where life was found. But I would not be surprised to find that the basic building blocks were not uncommon throughout the Universe.
edited to change common to uncommon in the last sentence.
[This message has been edited by jar, 05-01-2004]
Aslan is not a Tame Lion