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

User Alex Robinson
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4 votes

Answer:

Photosynthesis

User GaelF
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respirations

Step-by-step explanation:

of plants because they breathe in carbondioxide and breathe out oxygen

User Rajukoyilandy
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