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Across 1. isolation exhibited by giant tortoises on different islands 6. a trait that increases reproductive success 7. changes in groups over time 9. bones, teeth, frozen mammoths, footprints 12. comparative ____ determines human and chimp DNA is 98% identical 14. isolation mechanism exhibited by a sterile liger 15. fitness of mule 16. similar structures due to similar environments 17. phenomenon that favors dark moths in a polluted forest 19. 300 species of cichlid fish from a single ancestor 24. type of selection exhibited by light and dark pocket mice 25. law that states that younger rocks form on top of older rocks 26. when organisms blend with their surroundings 27. also known as selective breeding: _________ selection 28. selection in which the average trait has the highest fitness 29. survival of best adapted organisms; ________ selection

Down 2. mechanism that prevents mating between different species 3. male elks fight for access to females; _______ selection 4. CA kingsnake resembles the poisonous coral snake 5. isolation mechanism that makes fertilization unlikely 7. selective force in nature 8. similar structures inherited from common ancestor 10. measure by the # of offspring produced 11. Evolution would not be possible without it 13. isolation exhibited by Eastern and Western meadowlarks different mating songs 18. selection exhibited by peppered moths after industrial revolution 20. speciation caused by physical separation of original species 21. isolation exhibited by trout mating at different times of the year 22. Basis of Lamarck's theory: __________ traits 23. useless body parts