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