The Theory of Evolution

Across
1. name of the ship Darwin sailed on
6. published "The Origin of Species"
7. trees that show how organisms are related
9. the earth is thought to be 4.5 ___ years old
10. the process by which new species are formed
12. industrial melanism was seen in this insect
13. type of bird on the galapagos islands
16. when a species dies out, it becomes __
17. preserved remain of an organism that lived long ago
18. "survival of the fittest", natural ______
19. all the members of a species that live in the same place
20. finches on the Galapagos had different shaped _____

Down
2. theory that species change over time
3. structures that have no use
4. a species from which two or more species diverged (2 words)
5. scientist who studies fossils
8. closest living relative to humans
11. a bat's wing is homologous to a human ___
14. structures that share a common ancestry, similar in nature
15. ambulocetus was an ancestor of this modern animal