Across
1. diagram that shows relationships between species
3. related species share a common _____
5. process by which evolution occurs; natural ___
7. a model that is used to explain data and make predictions; ____ of evolution
10. preserved remains of ancient organisms
11. name of the ship Darwin traveled on, H.M.S._____
15. islands that Darwin collected observations from
16. a characteristic that helps an organism survive
18. population of organisms that can interbreed
19. when organisms disappear from the earth
20. passing of traits from parents to offspring |
Down
2. type of selection seen in dogs and other domestic animals
4. had different shaped shells depending on the island
6. when two unrelated organisms look alike (sharks & dolphins)
8. structures that are similar in different species; ex. arm bones of vertebrates
9. structures that have no function; ex. leg bones of whales
12. change over time
13. proposed the theory of evolution by natural selection
14. refers to the variety of living things
17. birds studied by Darwin |
