Bio, chapter 14, extra credit, Addi Lomholt

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Across
  1. 1. structures – leftover body parts with little or no use
  2. 3. – layers of rock or soil
  3. 5. age – exact age in years
  4. 8. – trait that helps an organism survive
  5. 10. tree – diagram showing evolutionary relationships
  6. 12. – idea that sudden disasters change Earth and species
  7. 13. age – age compared to other rocks/fossils
  8. 14. structures – body parts with similar origins but different functions
  9. 15. evolution – unrelated species develop similar traits
  10. 17. characteristics – traits gained during life
  11. 19. structures – body parts with similar function but different origins
  12. 20. radiation – one species evolves into many different species
  13. 22. selection – organisms with helpful traits survive and reproduce more
Down
  1. 2. – change in species over time
  2. 4. selection – humans choose traits to breed
  3. 6. – study of embryos and development
  4. 7. – ability to survive and reproduce
  5. 9. species – species showing traits of old and new groups
  6. 11. – two species evolve in response to each other
  7. 16. – study of where organisms live
  8. 18. evolution – related species become more different over time
  9. 21. with modification – species change as they pass traits to offspring