natural selection

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Across
  1. 2. selection - a natural process of evolution in which the organisms that are best
  2. 3. - an animal that hunts other animals for food
  3. 6. - corresponding structurally, often because of a common evolutionary origin
  4. 8. - a group of living things that can mate with one another but not with those of
  5. 13. - a variety
  6. 18. - the diversity of life forms on earth or part of the earth, including diversity
  7. 19. - everything that surrounds a particular type of living thing and affects its
  8. 21. - in biology, similar in form or function, but of different evolutionary origin
  9. 23. - to have young or offspring
  10. 25. sickness
  11. 26. - something that pollutes, esp. a waste substance that makes air, water, or land
  12. 27. - in biology, a change in an organism, over time, that better enables it to
  13. 29. - the child or young of a particular human, animal, or plant
  14. 31. - to fill with more inhabitants than available resources can sustain
  15. 32. - a condition that causes harm to the health of a person, animal, or plant;
  16. 34. structure, as opposed to gradual evolutionary change
  17. 36. groups
Down
  1. 1. - the degree to which something varies; amount of change or difference
  2. 4. species, genes, and ecosystems, esp. when regarded as providing the optimal
  3. 5. - the process or act of trying to win
  4. 7. or unhealthy; contaminant.
  5. 9. - of, pertaining to, or being a vestige, esp. an anatomical one
  6. 10. other less suited forms will become extinct
  7. 11. to their environment survive and are able to reproduce, while those that are
  8. 12. and multiply
  9. 14. - the branch of science that concerns the formation and development of
  10. 15. and health
  11. 16. changes that took millions of years
  12. 17. for evolution
  13. 20. - a sudden, apparently abnormal change or alteration in a genetically
  14. 22. of the Fittest - in biology, the evolutionary principle that only the forms of plants
  15. 24. - a way of hiding something by covering or coloring it so that it looks like its
  16. 28. - the theory that describes how all life forms developed from simpler life forms
  17. 30. - an animal being hunted, caught, and eaten by another animal
  18. 31. animals best suited to or most easily able to adapt to existing conditions will survive,
  19. 33. leave fewer or no offspring
  20. 35. - money or things that are available for a particular use