Why cellular respiration adds carbon dioxide to the atmosphere but photosynthesis does not ?

or:Why cellular respiration adds carbon dioxide to the atmosphere but photosynthesis does not ?or:The chemical process of respiration (breathing) in

or:Why cellular respiration adds carbon dioxide to the atmosphere but photosynthesis does not ?

or:The chemical process of respiration (breathing) in animals (including humans) is an entirely different process than the chemical process of photosynthesis in plants. In the process of respiration, oxygen (O2) is inhaled along with other atmospheric gases, mostly nitrogen (N2), while carbon dioxide (CO2) is exhaled along with other gases, again mostly nitrogen (N2), with the carbon source coming mainly from food. The oxygen inhaled is part of the cellular chemical process while nitrogen is not. In the process of photosynthesis, plants use carbon dioxide (CO2) from the atmosphere, water (H2O) from the soil, and sunlight to create a food product (glucose/sugar) that can be stored in the plant. The formula for photosynthesis looks like this: \t\t hv6CO2 + 6H2O \t----> C6H12O6 + 6O2 where hv represents the sunlight and should appear over the arrow; the numbers in front of the molecules are the number counts of molecules combining in the reaction while the other numbers are the number of atoms and should be written as subscripts. Cellular respiration is given by the same formula as photosynthesis, but in reverse, where food and oxygen are broken down into carbon dioxide and water; energy is released in respiration that is of course different from sunlight. So these processes can be seen as symbiotic.

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