To maintain cellular, tissue, organs, organ system, a constant supply of free energy from outside is required. Cells obtain energy from its surrounding either in the form of light energy or chemical energy to reduce and avoid entropy. Cells bearing chlorophyll synthesizes food molecules by using solar energy through the process of photosynthesis, which is then oxidized by plants and animals to liberate energy for all the practical purposes of the living system. In the form of ATP, energy can be stored, transferred and transformed in a living system.
Flow of information takes place by two routes which are as follows,
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