生物 せいぶつ分解 ぶんかいではありませんでした
biseibutsubunkaidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 微生物分解

1. Was not microbial decomposition.; Was not biodegraded by microbes.

Past/Perfective
Negative
Polite
Formal Register