Legend of Cell-da

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Across
  1. 4. Contains nearly all of a cell’s DNA
  2. 8. powerhouse of the cell
  3. 9. recurring hero in classic adventure game
  4. 10. World’s cutest doodle
  5. 11. founder of the The Lyceum
  6. 13. sans-_____ font
  7. 14. middle school headache homework
  8. 15. Break time for students
  9. 16. middle school subject and a theme of this puzzle
Down
  1. 1. number of Sages
  2. 2. Gibdo, Boss of the Lightning
  3. 3. treacherous elevated region north of Dark World
  4. 5. Gelatinous substance surrounding nucleus of a cell
  5. 6. autumn:equinox::_______:solstice
  6. 7. main villain in video game franchise
  7. 12. classic Nintendo game, and one theme of this puzzle