Hi หมอเจ๊ คนสวย แซ่เฮ again: (I think) Nitrogen fixers like legumes are a symbiotic relationship between bacteria and plants. There are also sulphur fixtures (bacteria); phosphorus fixers (again bacteria) and of course the most important ones 'carbon dioxide' fixers (bacetria -- which we should call "organic molecules builders".

What do you think? When we re-build 'a forest', we actually rebuild a universe ;-)