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Plants use the CO2 waste gas from animal respiration to make glucose for chemical energy for cells and they put out oxygen into the atmosphere. Oxygen is taken in by animals, used to break down glucose to make ATP for energy for cellular processes, and giving out CO2 which plants take in for photosynthesis.arbon dioxide is used by plants during photosynthesis to manufacture glucose; this is where the carbon in the equation comes from.
The foundation of the carbon cycle lies with plants. During photosynthesis, a plant absorbs carbon dioxide (one carbon atom and two oxygen atoms) from the atmosphere. Carbon is used to form the organic body of the plant, while oxygen is released back into the atmosphere.