why energy is required for the body to perform various life processes?
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if for human body then it is chemical energy. if for trees the it is solar energy
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speaking in terms of physics, work can not be done without energy, in fact, energy is the ability to do work, so all the motion carried by body needs energy, such as walking and beating if heart. Lots of chemical reactions in body, that is, metabolic reactions, need energy such as production of proteins for growth
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