> On planets or moons much further away where another liquid
> is in plentiful supply (eg methane) couldn't some kind of life develop
> that uses that instead?

I would say it's plausible.

Water's chemistry is somewhat unusual in a number of ways (particularly 
the fact that it can dissolve such a wide range of solutes), but it 
seems plausible to me that you could use some other solvent.

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