How a lot oxygen comes from the ocean?



The surface layer of the ocean is teeming with photosynthetic plankton. Though they're invisible to the naked eye, they produce more oxygen than the largest redwoods.

Scientists estimate that 50-80% of the oxygen manufacturing on Earth comes from the ocean. The vast majority of this manufacturing is from oceanic plankton — drifting crops, algae, and a few micro organism that may photosynthesize. One specific species, Prochlorococcus, is the smallest photosynthetic organism on Earth. However this little micro organism produces as much as 20% of the oxygen in our whole biosphere. That’s a better proportion than all the tropical rainforests on land mixed.

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