For electron acceptors:i DO serves aerobic bacteria;ii Nitrite serves obligately aerobic bacteria;iii DO serves obligately anaerobic bacteria;iv Nitrite can serve facultative bacteria. Choose the correct option.
Aerobic respiration uses oxygen as terminal acceptor. Facultative organisms can switch to alternative acceptors, such as nitrite, in anoxic conditions. Obligately aerobic and anaerobic categories do not interchange these oxygen requirements. Thus i and iv are the intended correct statements,**A**.
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