carbon dioxide
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Plants
Oxygen is the gas given out by green plants during photosynthesis.
Plants release oxygen as a waste gas.
oxygen
oxygen
oxygen
Plants give off oxygen gas in the light.
oxygen
Oxygen
Plants will typically produce one particular very famous and very needed gas. The gas that most plants will produces is oxygen.
Oxygen is the gas that animals use in respiration. Plants use both oxygen and carbon dioxide. (This is assuming you mean cellular respiration.)