Natural Selection Theory

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Across
  1. 2. Idea that only best-adapted organisms survive and reproduce (7, 2, 3, 7)
  2. 4. Shared origin of different species (6, 8)
  3. 7. Shared limb structure evidence for common ancestry in vertebrates (11, 4)
  4. 8. Evidence of evolution preserved in rocks (6, 6)
  5. 11. Process where individuals better adapted to environment survive and reproduce (7, 9)
  6. 12. When a species completely dies out (9)
  7. 13. Ship that carried Darwin on his famous voyage (3, 6)
  8. 15. Random change in DNA that can introduce variation (8)
  9. 16. Biological process of producing new individuals (12)
  10. 18. Producing more offspring than environment can support (13)
  11. 19. Human-controlled reproduction to emphasize desired traits (9, 8)
  12. 20. Formation of a new species from existing ones (10)
Down
  1. 1. Inherited trait that improves survival or reproduction (10)
  2. 3. Differences among individuals within a population (9)
  3. 5. Principle that all living things share a common origin (6, 7)
  4. 6. Scientist who proposed theory of evolution by natural selection (7, 6)
  5. 8. Birds studied by Darwin showing variation in beak shapes (7)
  6. 9. Trait that helps organisms blend into their surroundings (10)
  7. 10. Bacteria evolving ability to survive drugs (10, 10)
  8. 12. Gradual change in species over generations (9)
  9. 14. Environmental factor that influences survival (9, 8)
  10. 17. Insect used as an example of natural selection in action during Industrial Revolution (8, 4)