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L. According to a recent news report, some archaebacteria live at very high temperatures in entirely anaerobic environments a

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Option E is correct, it can be reduced in place of oxygen.

In aerobic respiration, oxygen is used in ETC ( electron transport chain) at complex IV. Where it reduced from oxygen to water. During this process ATP molecules are formed. But in anaerobic organism there us absence of oxygen so they are not efficient in terms of ATP production. But if organism is able to breath Fe and able to carry out cellular respiration. In that case it might act as oxygen, which is being reduced from Fe+2 to Fe +3 . And energy are produced. Here iron is functioning similar to oxygen in ETC.

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