What provides energy for all the cells in the body?

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The process of cellular respiration provides energy to all the cell in the body. In this process, glucose is broken down into carbon dioxide and water, in presence of oxygen, and energy is released in the form of ATP (adenosine triphosphate) molecules. The chemical equation for this process can be written as:

`C_6H_12O_6 + 6 O_2 -> 6 CO_2 + 6 H_2O + ATP`

ATP molecules are also known as energy molecules, since each of their phosphorus bonds can provide energy. 

The process of cellular respiration is more efficient when it takes place in the presence of oxygen. However, when occurring in anaerobic conditions, glucose breakdown can still result in a relatively low number of ATP molecules. 

Interestingly, the process of cellular respiration is complementary to photosynthesis and each process utilizes the products of other process as reactants. 

Hope this helps. 

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