noun, noun, used as a suffix
biological system; bio-
Used as a noun meaning a biological system or as a prefix/suffix in compounds like 生物系学科 (biology department) or 生物系廃棄物 (biological waste).
この大学には生物系の学科が三つある。
This university has three biology-related departments.
生物系廃棄物は専用の容器に捨ててください。
Please dispose of biological waste in the designated container.
生態系 means ecosystem, focusing on ecological relationships, whereas 生物系 is a broader term for biological systems or biology-related categories.
Compound of 生物 (living thing, organism) and 系 (system, lineage, group).