共生 きょうせい生物 せいぶつではありませんでした
kyōseiseibutsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 共生生物

1. Was not a symbiotic organism.; Was not a coexisting life form.

Past/Perfective
Negative
Polite
Formal Register