A. Filtration process is used
B. Biological action is used
C. Neither A. nor B.
D. Both A. and B.
Correct Answer: Biological action is used ✔
Last Updated: August 25, 2020
A. Filtration process is used
B. Biological action is used
C. Neither A. nor B.
D. Both A. and B.
Correct Answer: Biological action is used ✔
Last Updated: August 25, 2020