Evolution

3. one of the four factors of natural selection; differences in individuals in a population
8. Idea of why fossils have the same bones as living species
11. one of the four factors of natural selection; more offspring are produced than can survive
15. Similar structure in unrelated organisms
17. When the trees darkened the dark ones were the fittest
18. Name of the ship that Darwin sailed on
19. Evidence of ancient ancestors in sedimentary rock
20. What Darwin said why organisms evolve
22. An organism is fittest to survive when it can do this
24. Structure that is still around, but not used or needed

1. one main difference between each Galapagos Island
2. a well -supported testable explanation of phenomena
4. A Galapagos example of speciation
5. The ability to survive and reproduce in an environment
6. Similar structure that suggests a common ancestor
7. similarities in the ____ ____ is also used as a piece of evidence of evolution
9. Had different shaped shells to suit their environment
10. Island with similar organisms have different traits to suit their environment
12. one of the four factors of natural selection; resources are limited
13. Change over time
14. one piece of evidence of evolution, similarities in early developmental stages
16. Humans selecting for desired traits in organisms
21. Wrote his ideas about natural selection, but did not publish for years
23. a specific characteristic can also be called a _____.