Evolution and Natural Selection

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Across
  1. 2. can lead to analogous structures
  2. 6. when a few individuals from a larger group get isolated
  3. 11. physical features that change so they can best survive in the environment
  4. 13. a change in two or more species that are close associations
  5. 14. most reliable evidence for showing evolutionary relationships
  6. 17. can lead to homologous structures
  7. 19. the most successful of surviving and reproducing in their environment
  8. 20. a drastic reduction in the population size
  9. 21. has a nucleus and other membrane bound organelles
Down
  1. 1. bone and organ structure are similar
  2. 3. a change in a population's gene pool due to chance
  3. 4. mitosis
  4. 5. structures that are still present but don't serve a purpose anymore
  5. 7. evidence that life on earth has changed over time
  6. 8. has no nucleus
  7. 9. medicines don't work to kill off all the bacteria
  8. 10. meiosis
  9. 12. different bone structure but similar shapes
  10. 15. how a species acts or responses to situations for their survival
  11. 16. a new species forms because of evolution
  12. 18. there is no more of the species alive