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Phytoplankton in the Earth's oceans.

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14y ago
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Othon Welsh

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1y ago
20-50 percent comes from Diatoms.
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6mo ago

Around 80 percent of oxygen on Earth is produced by phytoplankton in the oceans. These microscopic organisms undergo photosynthesis, absorbing carbon dioxide and releasing oxygen into the atmosphere. Forests and other terrestrial plants also contribute significantly to oxygen production.

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Q: Where does 80 percent of oxygen comes from?
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