Evolution and Natural Selection

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Across
  1. 2. the study of embryos of different species
  2. 3. inherited structure, behaviour or physiology that allows an organism to survive well within its habitat
  3. 5. chemical which kills insects
  4. 7. map or study of where all species occurs
  5. 10. chemicals made to defend against bacteria
  6. 12. comparing strata in different locations to determine their relative ages
  7. 15. same element with different numbers of neutrons
  8. 16. wrote the Origin of the Species
  9. 18. differences between members of a species
  10. 21. layers of sedimentary rock
  11. 22. a group of organisms that can produce fertile offspring under natural conditions
  12. 23. describes living factors
Down
  1. 1. battle between members of same species for limited resources
  2. 4. the time between the birth of an organism and when they produce their own offspring
  3. 6. change in the characteristics of a species over many generations
  4. 8. diversity among organisms at an ecosystem, species and genetic level
  5. 9. the time it takes for half of a radioactive sample to decay
  6. 11. circular rocky structures thought to be the earliest evidence of living organisms called cynobacteria
  7. 13. the inherited ability of a species to withstand chemicals such as pesticides
  8. 14. structures that appear similar that have a common evolutionary background
  9. 17. describes nonliving factors
  10. 19. structures that appear similar but have a different evolutionary background
  11. 20. the preserved evidence in rocks or soils of organisms that were once alive