Evolution Crossword

2. structures that are similar
4. natural selection is also known as the survival of the ______
7. the name of the ship that darwin traveled on
9. the name of Darwin's book; the ___ of species
10. had different shaped beaks depending on the island they were from
11. well-supported testable explanation
15. the study of the earth
17. required for new species to form
18. had different shaped shells depending on the island they were from
19. pattern of evolution where a species is stable for a long time then rapidly changes; _____ equilibrium
20. change over time
21. structures that have no current function
23. preserved remains of ancient organisms
24. proposed the theory of evolution by natural selection

1. when two species evolve together
3. principle that states that living species are descended from ancient ones; descent with ______
5. process by which evolution occurs; natural ______
6. when two unrelated organisms look alike (sharks & dolphins)
8. when organisms disappear from the earth
12. when one species evolves into many; adaptive ____
13. a characteristic that helps an organism survive
14. islands that Darwin visited
16. formation of new species
22. refers to the variety of living things