Write the plural form of each of the following words. The word ending is underlined in each. vertebr a :_____ 2. gangli on :_____ 3. oment um :_____ 4. test is :_____ 5. lum en :_____ 6. matr ix :_____ 7. ser um :_____ 8. meni nx :_____ 9. foc us :_____ 10. pelv is :_____ 11. adeno ma :_____ 12. patell a :_____ 13. prognos is :_____ 14. bacteri um :_____ 15. fung us : _____