Alphabetical Science-ologys

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Across
  1. 4. The study of butterflies and moths
  2. 10. The study of the immune system
  3. 12. The study of ants
  4. 13. The study of rays, usually ionizing radiation
  5. 14. The study of classification
  6. 16. The study of the skin
  7. 18. The study of medicine relating to women
  8. 19. The study of bacteria
  9. 20. The study of underground water
Down
  1. 1. The branch of pathology that studies diseases on the cellular level
  2. 2. The study of wood
  3. 3. The study of the moon
  4. 5. The study of periodic biological phenomena
  5. 6. The study of cancer
  6. 7. The study of the atmosphere
  7. 8. The study of animal diseases
  8. 9. The study of movement in relation to human anatomy
  9. 11. The study of neural diseases
  10. 15. The study of the geology of celestial bodies
  11. 17. The study of volcanoes