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      Life is made up almost entirely of six light elements (in order of importance):

        C, H, O, N, P, S = 99%

        And trace elements: Fe,Mg,Ca,Na

        Some elements are necessary for life but not understood: Se

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      Molecules

      Combinations of atoms held together by bonds to form molecules: H2O, CH2O

inorganic compounds

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      Life is dependent on the molecules water & carbon dioxide (2 reactions) !

          Photosynthesis

             H2O + CO2 => CH2O + O2 L C

          Respiration

             H2O + CO2 <= CH2O + O2 K

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