BIOLOGY

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Across
  1. 2. characteristics
  2. 4. clock
  3. 6. Theory
  4. 8. equilibrium Ectoderm
  5. 12. Selection
  6. 13. genes
  7. 14. of the fittest
  8. 15. record
  9. 16. evolution
  10. 18. structure
  11. 19. group
  12. 20. Timescale
  13. 21. Clock
Down
  1. 1. nomenclature
  2. 3. for existence
  3. 5. descent
  4. 7. radiation
  5. 9. Darwin
  6. 10. structure
  7. 11. in genes
  8. 17. structure