Vocab part B

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Across
  1. 1. isolation. Physical differences prevent species from mating.
  2. 3. structure. Similar body parts in different species that evolved for the same purpose, but don't share a common ancestry.
  3. 8. Species change over time through genetic differences and natural selection.
  4. 9. of the fittest. The best-adapted organisms are more likely to survive and reproduce.
  5. 11. isolation. Species separated by physical barriers may evolve into new species.
  6. 12. divergence. Populations accumulate genetic differences over time.
  7. 14. Preserved remains or traces of ancient organisms.
  8. 15. isolation. Species living in different habitats don't reproduce together.
  9. 17. drift. Random changes in traits can occur, especially in small populations.
  10. 18. selection. Organisms with helpful traits survive and reproduce more.
  11. 19. isolation. Different mating behaviors prevent species from interbreeding.
  12. 20. Changes in DNA can lead to new traits.
  13. 21. Traits are passed down through DNA.
Down
  1. 2. selection. Humans choose specific traits in plants and animals.
  2. 4. The process by which new species form.
  3. 5. When a species completely disappears because it can't adapt.
  4. 6. isolation. Species that reproduce at different times can't mate.
  5. 7. structure. Similar body parts in different species due to common ancestry.
  6. 10. structure. Body parts that no longer serve their original function.
  7. 13. How well an organism survives and reproduces in its environment.
  8. 16. A helpful trait that improves survival and reproduction.