Classification and Evolution crossword

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Across
  1. 4. The biggest conflict to Darwin's theory
  2. 6. Division that produces 4 non-identical cells
  3. 7. The domain that fungi, plants and animals are in
  4. 9. A structure that appears superficially different in different organisms but has the same underlying structure
  5. 10. The type of variation between members of different species
  6. 16. The genus name for dogs
  7. 17. The presence of homologous structures provides evidence for?
  8. 18. Main cause of genetic variation
  9. 19. the top of the eight groups of classification
  10. 20. The name given to the evolutionary relationships between organisms
Down
  1. 1. The study if similarities and differences between organisms' anatomy
  2. 2. All of these contain chlorophyll
  3. 3. The kingdom bacteria falls into
  4. 5. Differences between organisms within a species
  5. 8. Who wrote the book "On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life
  6. 11. The lowest level of hierarchy
  7. 12. These are saprophytic feeders
  8. 13. The boat Darwin sailed on
  9. 14. The study of similarities and differences in the proteins sand molecules that control life processes
  10. 15. The study of fossils