I assume that you are referring to the first law of thermodynamics and the principle of the conservation of energy that states that energy can be transformed but not destroyed. The answer would be many fold. Most energy is transferred chemically in the form of protein, fats, and carbohydrate molecules that are broken down or “metabolized.” Plants receive energy from the sun and the soil. Animals receive energy from plants when we eat them. We furthermore get energy from other animals when we eat them as well. When an organism dies, i.e. a plant, an animal and ourselves, microorganisms break down its flesh and its energy is returned to the soil. And thus the cycle continues.
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