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Ions
are charged particles, and
electrolytes
are solutions of ions in water.
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Carbohydrates
are made of carbon with hydrogen and oxygen (in the same ratio as water) linked together. The cell mainly uses carbohydrates for energy.
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Fats
are also made of carbon, hydrogen and oxygen. They are a powerful energy source, and are also used for insulation.
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Proteins
are the building materials of the body, and as
enzymes
make cell reactions happen. They contain nitrogen as well as carbon, hydrogen and oxygen.
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Many also contain sulphur and phosphorous.