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Elaborate/explain? Like from a physics/chemistry point of view?
Chemistry these reactions in he lab or your body continue until the reactants are used up or something breaks down and it is not able to go anymore like in cell death. The reactions will end someday for whatever system you are observing be it a body, the sun, or even the universe all these things will progress toward a more stable form ( lower energy state ).The rate at which a system progresses to said form is dictated by the underlying reaction rate equation.
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