MCQ
The most common indicator organism which represents polluted water is:
- ✓Escherichia coli.
- BSalmonella typhi.
- CVibrio cholerae.
- DEntamoeba histolytica.
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$(A)$ The earliest organisms that appeared on the earth were nongreen and presumably anaerobes.
$(B)$ The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of the above statements which one of the following options is correct?
