Sustenance, the digestion by living creatures of food materials that empower them to develop, keep up with themselves, and recreate. Food serves different capabilities in most living organic entities. For instance, it gives materials that are used to supply the energy expected for the retention and movement of supplements, for the union of cell materials, for development and velocity, for discharge of side-effects, and for any remaining exercises of the organic entity. Food additionally gives materials from which every one of the primary and reactant parts of the living cell can be gathered. Living creatures contrast in the specific substances that they expect as food, in how they combine food substances or acquire them from the general climate, and in the capabilities that these substances do in their cells.
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