Crossword Puzzle: Evolution-Changes Over Time

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Across
  1. 2. a trait that helps an organism to survive and reproduce
  2. 3. fossils provide a historical sequence of life known as the ____ ____ ____
  3. 6. selecting organisms with desired traits to be parents of the next generation of offspring; does not follow rules of natural selection
  4. 9. when more offspring are produced (may not be enough resources for them); one of the three processes of natural selection
  5. 10. process by which individual organisms that are better adapted to their environment are more likely to survive and reproduce than other members of the same species
  6. 12. when no members of a species are still alive
  7. 16. "survival of the fittest"; one of the three processes of natural selection
  8. 17. millions of fossils that scientists have collected make up the ____ ____
  9. 20. any difference between individuals of the same species; one of the three processes of natural selection
  10. 22. ____ dating is another name often used for radioactive dating
  11. 24. Islands upon which Darwin observed much diversity of life
  12. 25. a diagram that shows how different groups of organisms may be related (also called a phylogenetic tree)
  13. 26. theory that evolution occurs slowly but steadily
  14. 28. another name for a branching tree
  15. 29. well tested concept with evidence that explains a wide range of observations
  16. 30. a type of structure that is no longer useful within a species to show evidence of changes within a species
Down
  1. 1. fossils that form when dissolved minerals change remains into rocks
  2. 4. paleontologists find most fossils in these rocks
  3. 5. similar structures that related species have inherited from a common ancestor
  4. 7. gradual change in a species over time
  5. 8. a homologous structure is a structure that shows how certain species have inherited a trait from a ____ ____
  6. 11. group of similar organisms that can mate with each other and produce fertile offspring
  7. 13. the name of Darwin's book explaining how evolution occurs by means of natural selection
  8. 14. preserved remains or traces of an organism that lived in the past
  9. 15. ____ dating is a technique that can determine the actual age of rocks that are fossils are found in
  10. 18. ___dating estimates the age of fossils by comparing rock layers
  11. 19. the goal for organisms are to survive long enough to ____ and pass along traits to offspring
  12. 21. naturalist who developed the theory of evolution by natural selection
  13. 23. evidence used when observing the embryonic development of various species of organisms to see if they are related
  14. 27. different varieties of animals within an ecosystem