Biology crossword

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Across
  1. 3. allows comparison between extinct and present day organisms
  2. 7. unit of inheritance (example eye color)
  3. 8. mechanism of evolution due to a change in environment
  4. 10. change in populations over time
  5. 12. traits found in both ancestors and their descendants
  6. 15. inherited characteristic that enhances fitness of an organism
  7. 17. strength, able to survive
  8. 18. was the first to build the theory of natural selection by studying organisms on Galapagos Islands
  9. 20. structures with same anatomical layout but different functions; support common ancestry
Down
  1. 1. prevent the attempt or act of mating
  2. 2. structures that express similar features due to similar environments not common ancestry
  3. 4. distribution of plants and animals
  4. 5. traits found in a specific descendant but not its ancestor; specific to that descendant
  5. 6. able to reproduce
  6. 9. mechanism of evolution; random changes in genetical material
  7. 11. version or type of gene (example blue eyes)
  8. 13. adaptation that allows an organism to blend into its environment
  9. 14. an adaptation that allows a harmless species to resemble a harmful species
  10. 16. mechanisms of evolution; changes in allele frequencies due to CHANCE events; impacts smaller populations
  11. 19. mechanism of evolution; movement of individuals into and/or out of a population; immigration and emigration are examples