The theory of natural selection

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Across
  1. 4. the process by which different kinds of living organisms are thought to have developed
  2. 6. the process whereby organisms better adapted to their environment tend to survive
  3. 9. organ or body part that appears in different animals
  4. 10. a change or difference
Down
  1. 1. an organism's ability to survive and reproduce in a particular environment.
  2. 2. similar or corresponding functions but not from the same evolutionary origin.
  3. 3. anatomical feature or behavior that no longer seems to have a purpose in the current form of an organism
  4. 5. change by which an organism or species becomes better suited to its environment.
  5. 7. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
  6. 8. identification by humans of desirable traits in plants and animals