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Across 1. ancestral relationships between species/ evolutionary history of a species 4. organism that does the killing and eating 5. phenomenon in nature that can fix nitrogen 9. nutrient cycle that does not involve the atmosphere 12. structures that are similar in structure but may have different functions 13. language of binomial nomenclature 14. burning of substances to release carbon dioxide 15. first part of the scientific name 20. the organism that the parasite lives off of 21. one organism feeds on or off of another organism 22. bacteria that live in extremely cold conditions 24. back and forth evolutionary adjustment between two species that interact 25. formed from remains of dead organisms, oil and petroleum 26. nitrate is converted to nitrogen and goes back into the atmosphere 29. two part naming system 31. general term for any category 35. set of groups that are related by descent 36. plants absorb nitrogen from soil and then animals eat the plants 37. liquid falls to earth as snow, sleet, or rain 39. 78% of the atmosphere is made of this gas 40. liquid to vapor when heated and moves back into the atmosphere 41. bacteria that live in extreme conditions 42. bacteria that live in highly basic conditions 43. use of oxygen to break down organic matter and release carbon dioxide 44. unique group of organisms united by heredity or interbreeding 45. relationship in which two species live in close association with each other 46. phylogenetic tree drawn a specific way

Down 1. long descriptive Latin phrases that used to be used to name organisms 2. group that lacks some of the shared characters on a cladogram 3. act of one organism killing another for food 6. relationship in which both species benefit 7. type of evolution in which similarities evolve in groups that are not closely related to one another 8. structures that evolve due to convergent evolution, similar function but different structure 10. branch of biology that deals with the study of classification systems and nomeclature 11. bacteria that live in extreme salty conditions 16. ammonia is converted to nitrite and then to nitrate 17. family tree that represents a hypothesis of the relationships between several groups 18. water moves into soil and becomes groundwater 19. nitrogen from animal wastes or decaying bodies is returned to the soil by bacteria 22. process that uses carbon dioxide and water to produce glucose and oxygen 23. organism that is killed and eaten 27. vapor changes to a liquid when cooled 28. water evaporates from leaves of trees and other plants 30. broadest taxon 32. practice of naming and classifying organisms 33. relationship in which one species benefits and the other is neither harmed nor helpe3d 34. bacteria that live in highly acidic conditions 38. most specific taxon