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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.
  Carbon dioxide was first identified in the 1750s by Joseph Black, a Scottish chemist and physician.   Carbon dioxide is a colouriess, odourless gas. It occurs in the â¦ atmospheres of many planets, including that of the earth.On the earth, all green plants must absorb carbon dioxide from the atmosphere to live and grow.   Green plants convert carbon dioxide and water into food and oxygen. Carbon dioxide has important uses in the home and in industry. For example, carbon dioxide released by baking powder or yeast makes cake batter rise. Carbon dioxide in soft drinks, beer, and sparkling wines gives the beverages their fizz.