__________ is an organism used to gauge the quality of an ecosystem

Q. __________ is an organism used to gauge the quality of an ecosystem.
A. Decomposers
B. Predator
C. Bio-remediator
D. Bioindicator
Answer: Bioindicator

A. Decomposers
B. Predator
C. Bio-remediator
D. Bioindicator
Answer: Bioindicator