If astronomers find life on Mars, it wold be such as we known here in Earth? It is necessary water? As Isee asked, it is possible to be produced in sulfuric acid or ammonium or whatever? If are the conditions produced to the emergency of a living being, a living being emerge (Maturana,2009). At least, we can answer two things. Yes and no. If we focus in the organization of living systems, this means processes and relations among processes realized by means of its components (water for example) (Maturana & Varela, 1997), properties of components can be obviated, structure can change in the conservation of organization (Maturana & Mpodozis, 2000). According to this, I dare to say that water is not necessarily a condition sine qua non
of life. On the other hand, as Villee (1996) shows as, water is an essential component of living matter, because all of the properties that Flakkarin mentioned us. So, its a very difficult question to solve. Personally, it`s very difficult to me try to imagine life without water, but who knows?¡, maybe science can surprises us again in the future
Maturana, H.(2009) Interview in: http://www.youtube.com/watch?v=UW9iXJOUfs8
, recovered on June, 1st, 2012.
Maturana, H.,Mpodozis,J.(2000) The origin of species by means of natural drift. Rev Chil Hist Nat;73(2):261-310.
Maturana, H., Varela, F.(1997) De Máquinas y Seres Vivos, autopoiesis de la organización de lo vivo, 2nd Ed.: Universitaria.
Villee,C.(1996) Biología (R. Espinoza, Trad.), 8th Ed.: McGraw-Hill.