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         Chemistry ChemistrySubstancesThis module explores substances through hypothetical and real-world examples. Substances are broadly classified as pure... 
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             Biology BiologyLipidsFats, oils, waxes, steroids, certain plant pigments, and parts of the cell membrane – these... 
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             Biology BiologyFats and ProteinsFats and proteins are two of the major nutrient groups that our bodies need. This... 
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