natural selection

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