We've had discussions here before about whether life chemistry on another world would need to be involve liquid water, and whether it would need to be based on a liquid at all.
From the Cosmos website:
" 'We think that life requires liquid,' says NASA Ames Research Centre planetary scientist Chris McKay. Life needs a medium that brings chemicals close enough together to interact but not so close that they can’t move. Gases are too diffuse and solids too cramped... "
Seems to me a good, simple explanation why astrobiologists like McKay are interested in looking for life on the surface of Titan, where there is rain and liquid lakes and seas, even though the liquid is a mix of methane and ethane rather than water.
What do others think?