greek/latin roots

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Across
  1. 2. something serious
  2. 6. people might call greens or something that happens on its own
  3. 8. a type of saying for boy and girl
  4. 9. something to boost your immune system
  5. 10. never lived
  6. 12. something that mainly everyone knows about
  7. 13. very clearly
Down
  1. 1. the study of life
  2. 3. something that happened worldwide
  3. 4. something you could call mankind
  4. 5. a group of people or people from the same family at different times
  5. 7. something that people might call ghosts
  6. 11. living or once living