Evolution

2. a well-supported testable explanation of phenomena that have occurred in the natural world
6. the study of fossil remains or other clues to past life
7. refers to the variety of living things
10. the formation of new and distinct species in the course of evolution
13. the structures evolved independently
14. the name of Darwin's book; the ___ of species
15. Charles Darwin’s theory of evolution states that evolution happens by what?
17. a characteristic that helps an organism survive
20. organs that serve no useful function in an organism

1. structures that are similar
3. when a species splits into a number of new forms when a change in the environment makes new resources available or creates new environmental challenges.
4. the most common way for one gene pool to become isolated from another.
5. had different shaped beaks depending on the island they were from
8. reduce the fitness of a hybrid offspring
9. when two species evolve together
11. father of evolution
12. Darwin collected the preserved remains of ancient organisms, called ____
16. when organisms disappear from the earth
18. required for new species to form
19. the name of the ship that Charles Darwin traveled on