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We need energy to survive, all the basic functions of a human to survive need energy, to maintain them from not stopping e.g. breathing , etc.
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Living things need energy for  several important processes that are vital to of the most important is the growth of life and repair of cells and tissues-energy is required for many bio chemical reactions that achieve is required for cells to perform many functions.celular respiration requires some amount of energy to enables living things to do work or to produce heat in their body.ENERGY is the currency used to run reactions in our body.without it,we die.we need energy to survive,all the basic functions of a human to survive need energy,to maintain them from not body and cells require constant supply of energy for a range of it clarified!!!any doubt,ask me....
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