脊索 せきさく動物 どうぶつ もんじゃなかったです
seki saku dōbutsumonja nakattadesu

Noun
Desu Copula

The polite, past negative form of 脊索動物門

1. Was not a chordate.; Wasn't a chordate.

Past/Perfective
Negative
Polite
Casual Register