Can someone please help explain how the attached chemistry chart works?

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This was actually pretty tricky.  Start at the top with the largest level of biological chemistry (organism).  The first big split seems sensible for dividing organic and inorganic (since that is a major type of division) and the four offshoots on the right seem made for the four major types of carbon macromolecules.  On the left, things seem to keep getting smaller, getting down to atoms, elements, etc.  The lowest two boxes seem the most sensible location for bonds and reactions.  So we fill in the chart as shown below.



             inorganic                                    organic

            elements                                macromolecules

     atoms       chemicals         proteins  nucleic acids   lipids   carbs

                    chemical bonds

                    chemical reactions

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