Sterling´s Crossword

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Across
  1. 5. along with radioactive dating with observations
  2. 8. used by scientists to determine how old fossils are
  3. 9. divide into epochs
  4. 11. where two species become one through there evolution
  5. 12. structures organisms that have similar bone structure
  6. 14. founder of genetics
  7. 15. divide into periods
  8. 16. structures that are similar in purpose but not in the form
  9. 18. collection of individuals of the same species in an area
  10. 19. preserved remains of ancient organisms
  11. 22. An animals job
  12. 24. a single species or a small group of species evolves into several different forms that live in different ways
  13. 25. studies bones
  14. 26. rock piled on rock on rock
  15. 27. when the last of a species dies
  16. 28. a random change in an allele frequency
Down
  1. 1. helps organisms be better suited to there environment
  2. 2. where one species diverges into two different ones
  3. 3. organs useless organs
  4. 4. organisms that are at the early stages of life
  5. 6. natures way of picking out the strong
  6. 7. go into dates
  7. 10. humans pick which organisms survive
  8. 12. life length of time it takes for half of the radioactive atoms to decay
  9. 13. the origins of multiple species
  10. 17. which modern organisms descended from ancient ones
  11. 20. English man who made the idea of natural selection
  12. 21. where two unrelated species keep the same similarities
  13. 23. the stock of different genes in an interbreeding population.