Singular and Plural Nouns

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Across
  1. 3. bacteria
  2. 4. quizzes
  3. 6. cactus
  4. 8. knives
  5. 12. indices
  6. 14. syllabi
  7. 16. tuna
  8. 17. deer
  9. 18. fungi
  10. 20. fish
Down
  1. 1. curricula
  2. 2. aircraft
  3. 5. bison
  4. 7. series
  5. 9. crises
  6. 10. oxen
  7. 11. calves
  8. 13. data
  9. 14. sheep
  10. 15. larvae
  11. 19. geese