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By definition, energy "is the capacity to do work." It involves either manufacturing of molecules, moving objects or generation of heat and light. How does it flow within its cycle? What happens when a living being takes in too much or not enough energy? Is it possible to exceed our need for energy intake for ourselves and our activities?

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Energy is defined and detailed.

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Energy is neither made nor destroyed; it is converted from one form to another. In living things, it tends to be consumed by processes that increase complexity, such as the building of a cell wall, while energy is released by processes that decrease complexity, such as the breakdown of glucose.

Living things require a certain amount ...

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