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A: Cells use energy in order to grow, regulate metabolism and reproduce. This energy is obtained from a source such as food molecules or light from the sun, and through processes like glycolysis, the citric acid cycle and oxidative phosphorylation, an energy-rich molecule is then created.
Cells get energy in the form of food molecules if they are animal cells or sunlight if they are plant cells. The process used by all cells to create usable energy is quite similar, no matter the source of the energy. Full Answer >.