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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.
  Actually plants do use oxygen and produce carbon dioxide. Plants â¦ need oxygen and glucose to respire (get energy). The key difference between plants and animals is that plants get their glucose by sticking carbon dioxide molecules and water molecules together, producing glucose and oxygen.OWEVER, Plants generally produce a NET NEGATIVE amount of carbon dioxide. Animals br â¦ eathe in Oxygen, use this to burn stored energy and perform work within the body, and in the process bond the oxygen to carbon producing carbon dioxide which is exhaled.