Puzzle 59

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Across
  1. 1. Study of animals
  2. 3. Study of living organisms
  3. 4. Study of body structure
  4. 7. Science of substances and reactions
  5. 8. Study of ecosystems
  6. 9. Study of plants
  7. 10. Study of matter and energy
Down
  1. 2. Study of earth materials
  2. 5. Study of celestial bodies
  3. 6. Study of heredity