Kind of a tangent but I'm really interested in why statements like:

> if you have carbon-based life forms, you will have water and CO2.

..can lead to statements like:

> it is just way more likely than any other form

I totally agree on the observation, but what is fascinating to me is why a deductive statement can be considered to indicate likelihood in probability. It seems there is a bit of abductive reasoning going on behind the scenes which neither the deductive logic or inductive probability can really capture on their own.