These phyla are: 1) Agnatha - jawless fish ; around 50 species in the world 2) <span>Chrondrichthyes - cartilaginous fish ; around 600 species in the world 3) </span><span>Osteichthyes - bony fish (divided into ray finned group and lobe finned group) ; around 30,000 species in the world.
Can you add the picture or describe it to me? Right now I'd guess that it's probably bacteria because bacteria breaks it down into ammonium and nitrate, which is taken up by the plants by a process of nitrogen fixation. So, D.
