Name: _________ Natural Selection Crossword

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Across
  1. 1. The process by which organisms that are best adapted to their environment are most likely to survive and reproduce.
  2. 7. Traits or behaviors that help an organism survive and reproduce.
  3. 8. The process by which two species evolve in response to changes in each other over time.
  4. 9. The age of one object compared to the age of another object.
  5. 12. Structures that are similar in different species and have been inherited from a common ancestor.
  6. 13. A group of similar organisms that can mate with each other and produce offspring that can also mate and produce offspring.
  7. 14. All the fossils that have been discovered and what scientists have learned from them.
  8. 15. A well-tested explanation for a wide range of observations or experimental results.
  9. 17. How well an organism can survive and reproduce in its environment.
  10. 18. The theory that changes in the earth’s crust during geological history have resulted from the action of continuous and uniform processes.
Down
  1. 2. Age, in years, of a rock or other object.
  2. 3. States that, in undisturbed rock layers, the oldest rocks are on the bottom and rocks become progressively younger toward the top.
  3. 4. A type of natural selection that acts on an organism’s ability to get the best possible mate.
  4. 5. Change in a species over time.
  5. 6. The natural process by which something takes place.
  6. 10. When all the members of a species cease to exist.
  7. 11. The struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time.
  8. 16. The preserved remains or traces of organisms that lived in the past.