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Metabolism is the uptake and digestion of food, and the disposal of waste products in living organisms. Because this process can happen at many levels within an organism, we can identify several kinds of metabolism:

The word metabolism comes from μεταβολισμος, the Greek word for "change". The correct definition of metabolism is almost as difficult as the definition of "life". For example, according to the definition above, fire has a metabolism, too (it "eats", for example, wood, converts it to heat, and disposes ashes).

See also: Biochemistry

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