Biology puzzle

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Across
  1. 4. study of plants
  2. 6. study of the relationship between both biotic and abiotic
  3. 7. the study of virus
  4. 8. study of gross structure of an organism
  5. 9. study of parasites
Down
  1. 1. the study of origin and descent of organisms
  2. 2. study of fishes
  3. 3. study of algae
  4. 5. the study of fungi