the kind of lost words

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Across
  1. 2. study of life in the ocean
  2. 5. study of blood and blood diseases
  3. 9. study of reptiles and amphibians
  4. 10. the study of freshwater systems
  5. 13. study of the formation of nature
  6. 14. study of mammals
  7. 15. study of animals with oInvertebratee
Down
  1. 1. study of worms
  2. 3. study of fish
  3. 4. study of the immune system
  4. 6. study of heredity and inherited traits
  5. 7. science dealing with the atmosphere and weather
  6. 8. study of the incidence
  7. 11. study of the geologic features of th ocean floor
  8. 12. study of water on earth