Like most plants, cacti use photosynthesis, which does not turn oxygen into carbon dioxide. Instead, they turn carbon dioxide, water, and light into oxygen and sugars such as glucose. Plants use the sugars for energy. But they do not need oxygen, so they expel it from their stomata (small openings through which they breathe). If it were not for photosynthesis, then there wouldn’t be enough oxygen in the atmosphere for us to survive!
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