Question

what is mean by metabolism,?

Answer 1

the chemical processes that occur within a living organism in order to maintain life is called metabolism.
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Answer 2

The word metabolism is thrown around quite a bit. 

, : all the chemical processes in your body, especially those that cause food to be used for energy 
chemical reactions involved in maintaining the living state of the cells and the organism. Metabolism can be conveniently divided into two categories: Catabolism - the breakdown of molecules to obtain energy. Anabolism

A CLEAR DEFINE

Metabolism: The whole range of biochemical processes that occur within a living organism. Metabolism consists of anabolism (the buildup of substances) and catabolism (the breakdown of substances). The term metabolism is commonly used to refer specifically to the breakdown of food and its transformation into energy.