Because H₂ levels in oxic environments are transient, it is likely that aerobic hydrogen bacteria shift between chemoorganotrophy and chemolithotrophy depending on levels of organic compounds and hydrogen in their habitats.

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The statement is true as aerobic hydrogen bacteria can switch between utilizing organic compounds and hydrogen as energy sources depending on their availability in oxic environments. As hydrogen levels in these environments are not stable, the bacteria need to be able to adapt their metabolism accordingly.

Because H₂ Levels in Oxic Environments Are Transient, It Is