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Oxygen is the waste product of: photosynthesis respiration the nitrogen cycle burning fossil fuels
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2 votes
Oxygen is the waste product of:

photosynthesis
respiration
the nitrogen cycle
burning fossil fuels

User Anubhav Singh
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2 Answers

5 votes
The answer is photosynthesis (also been called carbon dioxide) oxygen is just a waste product when plants do photosynthesis.
Hope this help man

User Ben Birney
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6.6k points
4 votes
Its photosynthesis because Plants can do two important things: Use energy from the sun to turn CO2 (carbon dioxide) and H2O (water)
User Solvemon
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6.6k points
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