生物 せいぶつ蓄積 ちくせきじゃなかったです
seibutsuchikusekijanakattadesu

Noun
Desu Copula

The polite, past negative form of 生物蓄積

1. Wasn't bioaccumulation.; Wasn't a living organism accumulating.

Past/Perfective
Negative
Polite
Casual Register