Most of the oxygen on earth is produced by ........

Science Affairs Botany

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Most of the oxygen on earth is produced by:

Grasses

Algae

Trees

Paddy fields

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Explanation:

Phytoplankton in the Earth's oceans produce between 50 and 85 percent of the planet's oxygen. The exact figure is difficult to calculate because scientists do not know how much phytoplankton exists on Earth. Phytoplankton, including algae, make oxygen by photosynthesizing sunlight.