閉鎖 へいさ血管 けっかん けいではありませんでした
heisa ke' kankeidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 閉鎖血管系

1. Was not a closed circulatory system.; Did not have a closed circulatory system.

Past/Perfective
Negative
Polite
Formal Register