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Across 3. characters such as amino acids and nucleotides that are used to help determine evolutionary relationships among species 6. he developed binomial nomenclature 14. an uncommon trait that separates two groups 16. grouping of objects or organisms based on a set of criteria 18. inherited features that vary among species 19. used to study the relationships among certain groups of organisms 21. a named group of organisms 22. not considered living because it is not made of cells and needs a host to "live" 24. can withstand low tempertures 27. the ___ species concept that states different groups of organisms are based on physical similarities 30. the ___ species concept that defines species in terms of populations and ancestry 31. the ___ species concept stated that a species is a group of organisms that are able to interbreed and produce fertile offspring 32. mutualistic relationship between algae and fungus 33. characters that have different function but anatomical similarity 34. threadlike material that composes fungi 37. descent with modification 38. domain that contains the most abundant group of organisms 40. protists that include slime molds 43. material that makes up cell walls of fungi 44. broadest taxon 45. evolutionary history of a species 46. most specific taxon 47. protists that include algae and kelp

Down 1. language for scientific names 2. 2 part naming system 4. organisms that die in the presence of oxygen 5. structures that have a reduced or no function in an adult organism 7. can withstand highly basic conditions 8. study of biological diversity with an emphasis on evolutionary history 9. he proposed the idea of evolution by natural selection 10. another name for phylum used for bacteria and plants 11. can withstand high temperatures 12. study of shape and structure of living things 13. domain that contains extremeophiles 15. tool used to classify organisms based on contrasting traits 17. increasingly well suited to the environment 20. protists that include protozoans such as amoebas 23. can withstand highly acidic conditions 25. can withstand extreme salty conditions 26. characters that have same function but different construction 28. material that makes up cell walls of plants 29. one of the men that redefined the term species in the 1930s 35. he developed the first accepted system of classification 36. study of biology concerned with identifying, naming, and classifying species based on relationships 39. organisms that need oxygen to live 41. first part of scientific name 42. one of the men that redefined the term species in the 1930s