Evolution and natural selection

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Across
  1. 3. distinct difference in organisms
  2. 4. a type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell
  3. 5. the change in species over time
  4. 7. the process of settling in an environment
  5. 10. environment changes that force a population to change
  6. 13. variability among living organisms
  7. 14. primate species humans belong to
  8. 16. ____ theory of evolution
  9. 17. genetic drift that occurs when the size of a population is severely decreased
  10. 19. the production of new organisms
Down
  1. 1. remains of a post existing organism
  2. 2. type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus
  3. 3. structures that are no longer needed in an organism
  4. 6. where species better adapted survive more efficiently
  5. 8. the bird Darwin observed
  6. 9. a population that were born at the same time
  7. 11. wipe out of a organism
  8. 12. breeding with another species
  9. 15. body structure of organism
  10. 18. whenever a organism is on the verge of extinction