Breanne Wilcox 14 extra credit

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Across
  1. 1. structures Reduced or unused body parts inherited from ancestors.
  2. 3. Layers of rock or soil with different ages.
  3. 5. age Exact age of a rock or fossil, often found using radiometric dating.
  4. 8. A trait that helps an organism survive in its environment.
  5. 10. tree Diagram showing evolutionary relationships among species.
  6. 12. The idea that Earth’s features formed through sudden disasters.
  7. 13. age Age of rocks/fossils compared to others (older or younger).
  8. 14. structures Body parts with similar structures due to common ancestry.
  9. 15. evolution Different species evolve similar traits independently.
  10. 17. characteristics Traits gained during life that Lamarck believed could be inherited.
  11. 19. structures Body parts with similar functions but different origins.
  12. 20. radiation Rapid evolution of many species from one ancestor.
  13. 22. selection Process where organisms with helpful traits survive and reproduce more successfully.
Down
  1. 2. Change in species over time through inherited traits.
  2. 4. selection Humans breeding organisms for desired traits.
  3. 6. Study of embryos and early development.
  4. 7. An organism’s ability to survive and reproduce.
  5. 9. species Organisms showing traits between ancient and modern groups.
  6. 11. Two species evolving together because they affect each other.
  7. 16. Study of where organisms live and how they are distributed.
  8. 18. evolution Related species become more different over time.
  9. 21. with modification Darwin’s idea that species change over generations and share common ancestors.