Sure, here's the reverse version of the first level of "Natural Science":

Subjects: Biology, Chemistry, Earth science, Astronomy, Physics

Is it about physical interactions at the atomic and molecular level?
   Yes: Chemistry
   No: Biology, Earth science, Astronomy, Physics - Is it about living things?
      Yes: Biology
      No: Earth science, Astronomy, Physics - Is it focused on a planet / planets?
         Yes: Earth science, Astronomy - Is it about our planet in particular?
              Yes: Earth science
              No: Astronomy
          No: Physics
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