However , there is conflicting evidence of this .
Increased instances of phaeosome symbiosis have been documented in a stratified , nitrogen - limited environment , and living within a host can provide an anaerobic environment for nitrogen fixation to occur .
There is conflicting evidence of this .
Increased instances of phaeosome symbiosis have been documented in a stratified , nitrogen - limited environment , and living within a host can provide an anaerobic environment for nitrogen fixation to occur .