The oxygen revolution changed Earth’s environment dramatically. Which of the following adaptations took advantage of the presence of free oxygen in the oceans and atmosphere? help please?

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anonymous · Answer

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ramirocruzo · Answer

If correctly studied, oxygen is used as the final electron acceptor in the electron transport chain. 
Before there was oxygen, cells could rely only on anaerobic respiration, which produces much less energy.
The oxygen revolution allowed cells to produce more energy, and therefore grow and become more complex.