BASIC 1. nucleus 2. nuclei 3. bacterium 4. bacteria 5. analysis 6. analyses 7. diagnosis 8. diagnoses 9. criterion 10. criteria 11. datum 12. data 13. thesis 14. theses 15. fungus 16. fungi 17. oasis 18. oases 19. cactus 20. cacti REVIEW 21. halves 22. shelves 23. heroes 24. studios 25. chiefs CHALLENGE 26. phenomenon 27. phenomena 28. curriculum 28. curricula
