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Earth’s Modern Oxygen Cycle On the modern Earth, molecular oxygen (O2) is produced through photosynthesis in sunlit surface environments in which cyanobacteria, algae, and plants use energy from the Sun to transfer electrons from water to biomass. Much of the biomass produced by the photosynthetic biosphere is consumed rapidly through aerobic respiration, which gains energy by transferring electrons from biomass back to O2. These coupled processes can be denoted as:

Biogeochemical Controls on the Redox Evolution of Earth’s Oceans and Atmosphere