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I believe that the idea of atoms making us a diverse is a good story.  The fact that we are all made up of the same components but in different ways makes sense.  Also, the way that the same molecule can have so many different structures and therefore make life so much more diverse is fascinating.  Just thinking about the different arrangements, combinations etc. is mind boggling.  We've only talked about hydro carbons so far-so it’s interesting to think about all of the other different types of molecules and their varieties of structures.  I do believe that diversity stemming from the simpler components to structures is a good story.