By metabolism we include:

respiration - breathing, aerobic and anaerobic
energy intake - feeding or photosynthesis

excretion - disposal of waste products

Metabolism is the mechanism by which living things extract energy from the environment and use it for growth, movement, neural activity and other functions.  The  energy is essentially the by-product of chemical processes that the organism is capable of producing, and is then exploited by the organism to make it function.


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