Final answer:
Carbohydrates, fats, and proteins are the major sources of energy in the body, each playing a crucial role in providing energy for cellular functions.
Explanation:
Carbohydrates, fats, and proteins are the major sources of energy in the body. Carbohydrates and fats provide energy primarily through their chemical bonds, which are converted into cellular energy that fuels the body's functions. Proteins, although they can serve as a fuel source, are mainly essential for building body tissue and providing amino acids.
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