On a cellular level, ____ is defined as "the chemical processes by which an organism supplies its cells and tissues with the oxygen needed for metabolism and relieves them of the carbon dioxide formed in energy-producing reactions."

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Respiration is the process by which an organism supplies its cells with oxygen and relieves them of carbon dioxide. Ventilation refers to the movement of air into and out of the lungs, whereas oxygenation refers specifically to the process of oxygen entering the bloodstream from the lungs. Hydration refers to the absorption of water by the body.

On a Cellular Level, ____ Is Defined as "The Chemical