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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.
Plants pull carbon dioxide from the atmosphere, releasing the  oxygen and retaining the carbon, in a process known as  photosynthesis. Most photosynthesis is performed by ma â¦ rine (ocean)  cyanobacteria.    Plants, trees and forests act as big carbon sinks, provided they do  not burn.arbon dioxide doesn't really hurt the atmosphere. Venus and Mars both have atmospheres comprised primarily of CO2. CO2 is also a necessary constituent of our atmosphere for â¦ plant respiration (photosynthesis) and for keeping the earth warm.