evolution

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Across
  1. 2. carry dormant plant embryos packaged with a food supply and protected from drying out.
  2. 4. is an obtaining food.
  3. 7. is the study of past life
  4. 8. produce seeds in fruit
  5. 12. is short, irregular burst of speciation
  6. 13. discoveries began to reveal the history of life on earth
  7. 14. are nonvascular and seedless
  8. 16. proposed the first scientifically testable evolutionary theory
  9. 17. share many molecular features with plants
  10. 20. is the science of describing, naming, classifying species
Down
  1. 1. cause species to diverge
  2. 3. helps to define species
  3. 5. frequency vary between populations
  4. 6. are naked seed plants
  5. 9. is slow and steady speciation
  6. 10. marks the end of the line
  7. 11. proposed the species arise from a common ancestor and are changing
  8. 15. can lead to allopatric speciation
  9. 18. genetic change over time
  10. 19. similar but did not derive from common ancestor