In the One Year War[?], he was in service on White Base when Char Azanable attacked an independent colony, Side 7[?].
Reference http://www.animefu.com/index.pl?node_id=9926
... release oxygen. One significant group of such organism are bacteria which use hydrogen sulfide instead of water in their photosynthetic pathway: CO2 + 2 H2S → CH2O + ...