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Across 4. This was Georges Louis Leclerc de Buffon’s occupation as well as Lamark’s 12. _________ structures are remnants of organs or structures that had a function in an early ancestor. 14. A tiger’s jaw size and tooth size is an example of ____ traits. 16. The process by which humans change a species by breeding it for certain traits is called _________ _________. 17. unites all fields of Biology 18. traces of organisms that existed in the past 21. the ability of a trait to be passed down from one generation to the next 22. At first scientists used fossils as evidence for _____, not evolution. 26. Structures that take on new purposes in an organism Environmental This type of change causes many adaptive changes which cause certain adaptations to be favored in a population 28. ______ fossils show the evolutionary traits of a group, as well as common ancestry between groups. 29. Sequences of DNA nucleotides which also provide evidence of evolution 30. the modern synthesis of evolutionary theory is the study of natural selection combined with ____ 32. All the individuals of a species that live in an area. 34. Part of the theory of natural selection where an organism produces an excessive amount of offspring to increase the chance of the offspring’s collective survival 36. Passing traits from parent to offspring 37. The theory of ____________ states that natural disasters such as floods and volcanic eruptions have happened often during Earth’s long history 39. The study of the distribution of organisms around the world. 40. While having many offspring raises the chance that some will survive, it also results in competition between offspring for resources. 41. Darwin’s proposal that all species descended from one common relative. 45. Used to be a controversial subject to teach in school 47. This scientist proposed that all living things were descended from a common ancestor and that more-complex forms of life arose from less complex forms (first name). 48. Can only act on existing traits 49. ___________ structures are features that are similar in structure but appear in different organisms and have different functions. 50. a group of organisms that are able to reproduce and have fertile offspring. 51. ______ genes are sequences of genes found in many organisms that control the development of specific structures 52. the changes he observed in landforms resulted from slow changes over a long period of time, a principle that became known as __________

Down 1. The sequences of nucleotides in a gene change over time due to mutations. It depends on the fact that the more related two organisms are, the more similar their DNA will be. 2. This was what Carolus Linnaeus did as a job 3. An __________ is a feature that allows an organism to better survive in its environment. 5. At the Galapagos islands, Darwin observed a species of birds called _____ 6. Limited food supply and ____ keep the population from overflowing. 7. People used to think that the earth was ____ thousand years old. 8. In artificial selection, ____ are the selective agents. 9. Structures that perform a similar function but not similar in origin 10. This scientist proposed that species shared ancestors instead of arising separately. He also rejected the common idea of the age of the Earth. He suggested that it was much older (last name). 11. natural selection over a large period of time that result in adaptations that are better suited towards their environment from generation to generation 13. The study of fossils or extinct organisms, continues to provide new information and support current hypotheses about how evolution occurs 15. _______ _________ is a mechanism by which individuals that have inherited beneficial adaptations produce more offspring on average than do other individuals. 19. This scientist developed a classification system(last name). 20. Similarities among cell types across organisms can be revealed by comparing their proteins, a technique called molecular fingerprinting 23. A measure of the ability to survive and produce more offspring relative to other members of the population in a given environment 24. organisms struggle for food, water, and shelter to survive 25. Natural selection happened to the finches, involving ___ shape 27. Bat wings compared to insect wings is an example of ___ structures 31. This theory states that the geologic processes that shape Earth are uniform through time 33. the difference in the physical traits of an individual from those of other individuals in the group to which it belongs. 35. A famous geneticist once said, “Nothing in biology makes sense except in the light of evolution.” (last name) 38. The human appendix is a _____ structure 42. A four limbed animal 43. a comparison between larvae of two organisms and searching for differences and similarities between them to indicate a possible common ancestry 44. This scientist proposed that all organisms evolved toward perfection and complexity(last name). 46. Lyell idea of uniformitarianism combined ___’s ideas.