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Across 1. the study of the distribution of species 5. breeding members of a species for specific traits 7. a similar structure inherited from a common ancestor 13. the elimination of extremes when they lead to less fitness 14. newly formed traits that can not be traced to a common ancestor 18. scientist who made false theories that traits were acquired over time 20. the killing off of the majority of a pathogen leaving only immune pathogens making it more harmful as a whole 29. the change in sexual ratio due to competition and necessity 30. a species evolves into a new species while the ancestor is still present 31. one species evolving into many in response to many new habitats 32. a scientist that made many theories that are still believed to be true 33. a part of a population is separated from the rest sometimes making uncommon traits more common

Down 2. the explanation of abrupt changes in a species 3. Evidence that supports the theory of evolution over millions of years 4. adaptations to a species that allow it to blend into its environment 6. populations produce more offspring than can survive 8. unrelated species living in different habitats that evolve into similarly 9. the theory that evolution proceeds in small steps 10. the elimination of average traits and the expression of both forms of extreme traits 11. a trait that can be traced to a common ancestor 12. differences in a population 15. the increase of an extreme form of a trait when it makes the organism more fit 16. a structure that was once used for something that may indicate a common ancestor 17. a physical barrier that divides a population and may eventually keep them from breeding 19. traits are passed on according to its contribution to the species survival 21. a similar structure not inherited from a common ancestor and derived independently from each other 22. co-writer with Charles Darwin of the book "On the Origin of Species by Means of Natural Selection" 23. The change of a species as a whole to adjust to its environment 24. two species evolving together in response to the other that may result in mutualism or parasitic dependency 25. a common ancestor among many different species 26. one species evolves to resemble another 27. a traits contribution to the following generation often measured in amount of offspring produced 28. reduced diversity in a population