[Fyron]

But anyway any assortment of volcanic gases and industrial cleaners could become atmospheres. There are plenty of deep sea vent dwellers that live on sulfides. Chlorine planets could be inhabited by sentient colonies of extreme halophiles.

Yes, and those are not very complex organisms. More complex organisms thriving in such environments is much harder to rationalize.

Slick, what was the point of stating that? My point was that you seem to be placing a lot of value in what Drake said, even though he probably wasn't all that correct.