The following link is to a 32-minute video produced and narrated by
Isaac Arthur. The video discusses the ramifications of life which
uses ammonia instead water as a solvent:
<
https://youtu.be/DNAzIg855E0?t=0>
The video above borrows heavily from the following paper:
<
https://ntrs.nasa.gov/api/citations/20040015106/downloads/20040015106.pdf>
Now onsider what the phrase "life as we know it" means. The paper
make the point that life on Earth evolved at least two forms of
photosynthesis; the O2/H2O redox couple used by plants and animals,
the the S2/H2S redox couple used by sulfur bacteria. Given that, it
would be reasonable to define "life as we know it" to mean any life
which uses some kind of chemical redox couple. In that sense, life
which used ammonia as a substitute for water would also be considerd
"life as we know it".
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