1. What "O" is a gaseous compound known in chemistry as O3 (subscript 3) found in our atmosphere?
2. What "O" is a surname which links Chris, Daniel and David?
3. What "O" is the Pokémon that evolves into Gloom?
4. What "O" is a government appointee who addresses complaints of individual citizens?
5. What "O" is Latin for "East"?
6. What "O" is an anagram of CARTHORSE?
7. What "O" is, in Marvel Comics, a being of psionic energy created by Professor Charles Xavier and Magneto?
8. What "O" is the country whose capital city is Ulan Bator?
9. What "O" is a Greek anise-flavoured liqueur?
10. What "O" is a herb, that in Greek means "Joy of the Mountain"?
11. What "O" is a creature with the Latin name "Struthio Camelus"?
12. What "O" is a US state, whose capital is Salem?
13. What does the "O" mean in an OS map?
14. What "O" is a Roman poet whose works insclude Ars Amatoria and Remedia Amoris?
15. What "O" was a TV talent show presented by Bob Monkhouse?
16. What "O" is a valid anagram of PATIOED?
17. What "O" was the 2nd novel written by Charles Dickens?
18. What "O" is the branch of medicine that studies tumours and cancers?
19. What "O" describes a component of cells, such as nuclei and ribosomes?
20. What "O" is a chemical element, atomic number 76?
21. What "O" in Greek mythology, ventured to the Underworld to rescue his love Eurydice?
22. What "O" describes the process of bone formation?
23. What "O" describes smell receptors (or possibly the ancient building where they're made)?
24. What "O" is an actor who starred in Wedding Crashers and You, Me and Dupree?
25. What "O" is RELATES+O?
26. What "O" was a 2003 action film starring Johnny Depp, Antonio Banderas and Salma Hayek?
27. What "O" is the last letter of the Greek alphabet?
28. What "O" is a band, formerly known as Halogen, whose hits include "Bright Idea" and "Happiness"?
29. What "O" is the palindromic school bus driver from The Simpsons?
30. What "O" is an anagram of COOLEST?
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