What did fish evolve from?

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  1. #years
  2. #about
  3. #million
  4. #craniates
  5. #vertebral
  6. #first
  7. #skull
  8. #leading
  9. #explosion
  10. #evolution
  11. #cambrian
  12. #jawless
  13. #during
  14. #column
  15. #vertebrates
  16. #agnatha
  17. #developed
  18. #began
  19. #belong
  20. #chordates
  21. #early
  22. #lineages