Natural selection

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Across
  1. 4. Actions of an organism.
  2. 5. Heredity unit.
  3. 7. Traits enhance survival.
  4. 8. Evolution theorist.
  5. 10. New species formation.
  6. 13. Same period group.
  7. 15. Beneficial for survival.
  8. 16. Struggle for resources.
  9. 18. Passed traits.
  10. 19. DNA differences.
Down
  1. 1. Survival and reproduction ability.
  2. 2. Spread of species.
  3. 3. Survival of the fittest.
  4. 6. Gene to product process.
  5. 9. Gradual development.
  6. 11. DNA change.
  7. 12. Body functions.
  8. 14. Control others.
  9. 17. Organism feeding on another.
  10. 20. Organisms adjust to the environment.