Plankton gives more oxygen to the atmosphere.
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No it isn't. We still have about 21% oxygen content in the atmosphere.
Yes plants use photosynthesis to produce more oxygen, and also oxygen in rocks can escape to the atmosphere.
No. Earth's atmosphere is a mixture, mostly comprised of nitrogen and oxygen.
Algae and later plants used sunlight to convert water and carbon dioxide into carbohydrates and oxygen. Until about the middle of the Paleozoic oxygen went into the atmosphere faster than it could be removed.
the atmosphere is made of carbon dioxide and other gases e.g. oxygen and carbon dioxide