Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test General Science Biology Ecology & Environment
The most common indicator organisms that represent polluted waters is
1
E. coli
2
S. typhi
3
C. vibrio
4
More than one of the above
5
None of the above