Evolution Crossword

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Across
  1. 3. A change in DNA that introduces variation into a population
  2. 4. A type of fossil showing features of ancestral and later groups
  3. 5. The study of genes and heredity
  4. 10. The disappearance of a species
  5. 12. The formation of a new species
  6. 14. A trait that improves survival or reproduction
  7. 15. The process by which advantageous traits become more common
  8. 16. A barrier that prevents populations from interbreeding
  9. 17. An early stage of development before birth or hatching
  10. 18. Preserved remains or traces of ancient organisms
  11. 19. The five-digit limb pattern shared by most mammals
  12. 20. The movement of alleles between populations
Down
  1. 1. Differences between individuals in a population
  2. 2. A source of new genetic variation in populations
  3. 6. An adaptation that helps an organism avoid detection
  4. 7. An organism that hunts other organisms
  5. 8. A different version of a gene
  6. 9. An earlier species from which other species evolved
  7. 11. An organism that lives on or in a host and causes harm
  8. 13. Structures with the same underlying anatomy but different functions
  9. 14. Structures with similar functions but different underlying anatomy
  10. 17. The gradual change in populations over generations