Y as in symbol

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Across
  1. 2. if we didn't have ______ we would all die.
  2. 5. when you feel sorry for something.
  3. 7. something that is a mysterious obscure
  4. 8. something that represents something.
  5. 9. you would use it in a word.
  6. 11. a word that has the same meaning as another word but spelt differently.
  7. 12. something that has pyramids.
  8. 15. a white blood cell in our body.
  9. 16. something that has a circle on both ends of the shape
Down
  1. 1. a sport that you would have to be good on a trampoline to play the sport.
  2. 2. supplied, treated or enriched with oxygen.
  3. 3. the quality of being made up of exactly similar parts facing each other.
  4. 4. the most important part of the event
  5. 6. someone who studies myths.
  6. 10. a big tall four sided rectangle that you would see in a desert.
  7. 13. something that is most expected.
  8. 14. a musical note or the words that you sing in a song.