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The macronutrients -- fat, protein and carbohydrates -- are high in energy density, which means that they have 4 or more calories per gram. The other essential nutrients -- water, vitamins and minerals -- have no calories, so they provide no energy.
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Paleozoic, Mesozoic and Cenozoic eras.
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He discovered all atoms contain tiny negatively charged subatomic particles or electrons with cathode ray tubes.
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