Evolving photosynthesis/discarding 02 seems (to a non-chemist like me
anyway) unlikely, a little like trying to get rich by discarding gold.
You are right it's a key question for Europa. Assuming simple life
evolves frequently in the universe, I wonder where on the scale from
oddity to inevitable today's Sagans think it is
- Bill
"TAYLOR, MICHAEL" wrote:
>
> To me, the real question regarding alternative energy production systems is
> whether any of them might produce a molecule of oxygen as waste, as
> photosynthesis does. You get free O2 in the water, you've got the
> possibility of large, robust organisms not unlike ourselves. Any other
> energy system--while leading to interesting life, no question--is likely to
> remain 100 % microbial, precluding bug-eyed mosterns in the Europan seas.
>
==
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