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